{"id":15885,"date":"2026-07-06T14:00:40","date_gmt":"2026-07-06T18:00:40","guid":{"rendered":"https:\/\/zobi.alcowep.com\/bourtagshdrevxnls658739\/examining-algal-blooms-in-blue-mesa\/"},"modified":"2026-07-06T14:00:40","modified_gmt":"2026-07-06T18:00:40","slug":"examining-algal-blooms-in-blue-mesa","status":"publish","type":"post","link":"https:\/\/zobi.alcowep.com\/bourtagshdrevxnls658739\/examining-algal-blooms-in-blue-mesa\/","title":{"rendered":"Examining Algal Blooms in Blue Mesa"},"content":{"rendered":"<h2 style=\"text-align: center\">Examining Algal Blooms in Blue Mesa<\/h2>\n<p><!-- no image --><\/p>\n<div class=\" hds-module hds-module-full alignfull wp-block-nasa-blocks-secondary-navigation\">\n<div class=\"hds-secondary-navigation-wrapper z-top width-100 padding-0\">\n<div class=\"hds-secondary-navigation width-full border-bottom-1px text-center hds-color-mode-dark hds-module hds-module-full alignfull wp-block-nasa-blocks-hdsnav\"><button type=\"button\" 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grid-container-block bg-spacesuit-white padding-x-0 padding-y-6 margin-x-auto nasa-block-align-center\">\n<div class=\"padding-x-0 grid-col-12\">\n<p>\t\t\t<!-- curtain view --><\/p>\n<div class=\"img-comparison-slider-parent comparison-view-active\">\n\t\t\t\t<img-comparison-slider><br \/>\n\t\t\t\t\t<img decoding=\"async\" slot=\"first\" src=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20170919.jpg\" alt=\"\"><br \/>\n\t\t\t\t\t<img decoding=\"async\" slot=\"second\" src=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117.jpg\" alt=\"\"><br \/>\n\t\t\t\t<\/img-comparison-slider><\/p>\n<div class=\"curtain-view-label-wrapper curtain-view-before\">\n\t\t\t\t\t<span class=\"curtain-view-label\">November 15, 2017<\/span>\n\t\t\t\t<\/div>\n<div class=\"curtain-view-label-wrapper curtain-view-after\">\n\t\t\t\t\t<span class=\"curtain-view-label\">November 17, 2021<\/span>\n\t\t\t\t<\/div>\n<\/div>\n<p>\t\t\t<!-- toggle view --><\/p>\n<div class=\"toggle-comparison-parent\">\n\t\t\t\t<!-- if image_1 is active the show image_1 --><\/p>\n<div class=\"hds-media-wrapper margin-left-auto margin-right-auto\">\n<figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-cover toggle-view-image toggle-view-before-image toggle-view-active\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1440\" height=\"960\" src=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20170919.jpg?w=1440&#038;h=960&#038;fit=clip&#038;crop=faces%2Cfocalpoint\" class=\"attachment-medium_large size-medium_large\" alt=\"The first of a pair of satellite images shows the reservoir in November 2017, when water levels were relatively high and its color was mostly blue.\" block_context=\"nasa-block\" loading=\"eager\" srcset=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20170919.jpg?w=1440&#038;h=960&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1440w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20170919.jpg?w=300&#038;h=200&#038;fit=crop&#038;crop=faces%2Cfocalpoint 300w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20170919.jpg?w=768&#038;h=512&#038;fit=crop&#038;crop=faces%2Cfocalpoint 768w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20170919.jpg?w=1024&#038;h=683&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1024w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20170919.jpg?w=400&#038;h=267&#038;fit=crop&#038;crop=faces%2Cfocalpoint 400w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20170919.jpg?w=600&#038;h=400&#038;fit=crop&#038;crop=faces%2Cfocalpoint 600w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20170919.jpg?w=900&#038;h=600&#038;fit=crop&#038;crop=faces%2Cfocalpoint 900w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20170919.jpg?w=1200&#038;h=800&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1200w\" sizes=\"auto, (max-width: 1440px) 100vw, 1440px\"><\/figure><figcaption class=\"hds-caption padding-y-2\">\n<div class=\"hds-caption-text p-sm margin-0\">Cyanobacteria blooms turned Blue Mesa Reservoir green from September through November 2021, when water levels were among the lowest on record. The OLI (Operational Land Imager) on Landsat 8 captured this image (right) of a bloom on November 17, 2021, when the water was near its lowest level; the left image shows the same area on November 15, 2017, when water levels were closer to normal.<\/div>\n<div class=\"hds-credits\">NASA Earth Observatory \/ Lauren Dauphin<\/div>\n<\/figcaption><\/div>\n<p>\t\t\t\t<!-- if image_2 is active the show image_2 --><\/p>\n<div class=\"hds-media-wrapper margin-left-auto margin-right-auto\">\n<figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-cover toggle-view-image toggle-view-after-image\"><img decoding=\"async\" width=\"1440\" height=\"960\" src=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117.jpg?w=1440&#038;h=960&#038;fit=clip&#038;crop=faces%2Cfocalpoint\" class=\"attachment-medium_large size-medium_large\" alt=\"The second image in the pair shows the same part of the reservoir in November 2021, when water levels were much lower and its color was much greener.\" block_context=\"nasa-block\" loading=\"lazy\" srcset=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117.jpg?w=1440&#038;h=960&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1440w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117.jpg?w=300&#038;h=200&#038;fit=crop&#038;crop=faces%2Cfocalpoint 300w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117.jpg?w=768&#038;h=512&#038;fit=crop&#038;crop=faces%2Cfocalpoint 768w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117.jpg?w=1024&#038;h=683&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1024w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117.jpg?w=400&#038;h=267&#038;fit=crop&#038;crop=faces%2Cfocalpoint 400w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117.jpg?w=600&#038;h=400&#038;fit=crop&#038;crop=faces%2Cfocalpoint 600w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117.jpg?w=900&#038;h=600&#038;fit=crop&#038;crop=faces%2Cfocalpoint 900w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117.jpg?w=1200&#038;h=800&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1200w\" sizes=\"auto, (max-width: 1440px) 100vw, 1440px\"><\/figure><figcaption class=\"hds-caption padding-y-2\">\n<div class=\"hds-caption-text p-sm margin-0\">Cyanobacteria blooms turned Blue Mesa Reservoir green from September through November 2021, when water levels were among the lowest on record. The OLI (Operational Land Imager) on Landsat 8 captured this image (right) of a bloom on November 17, 2021, when the water was near its lowest level; the left image shows the same area on November 15, 2017, when water levels were closer to normal.<\/div>\n<div class=\"hds-credits\">NASA Earth Observatory \/ Lauren Dauphin<\/div>\n<\/figcaption><\/div>\n<div class=\"toggle-button-container padding-1\">\n\t\t\t\t\t<button class=\"toggle-view-before-button toggle-comparison-view-active margin-right-1px\"><span class=\"toggle-view-before-label\">November 15, 2017<\/span><\/button><button class=\"toggle-view-after-button margin-left-1px\"><span class=\"toggle-view-after-label\">November 17, 2021<\/span><\/button>\n\t\t\t\t<\/div>\n<\/div>\n<p>\t\t\t<!-- 2-up view --><\/p>\n<div class=\"two-up-view position-relative bg-carbon-10\">\n<div class=\"grid-row\">\n<div class=\"grid-col flex-3 padding-top-4 padding-bottom-4\">\n<div class=\"hds-media-wrapper margin-left-auto margin-right-auto\">\n<figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-cover \"><img decoding=\"async\" width=\"1440\" height=\"960\" src=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20170919.jpg?w=1440&#038;h=960&#038;fit=clip&#038;crop=faces%2Cfocalpoint\" class=\"attachment-medium_large size-medium_large\" alt=\"The first of a pair of satellite images shows the reservoir in November 2017, when water levels were relatively high and its color was mostly blue.\" block_context=\"nasa-block\" loading=\"lazy\" srcset=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20170919.jpg?w=1440&#038;h=960&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1440w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20170919.jpg?w=300&#038;h=200&#038;fit=crop&#038;crop=faces%2Cfocalpoint 300w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20170919.jpg?w=768&#038;h=512&#038;fit=crop&#038;crop=faces%2Cfocalpoint 768w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20170919.jpg?w=1024&#038;h=683&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1024w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20170919.jpg?w=400&#038;h=267&#038;fit=crop&#038;crop=faces%2Cfocalpoint 400w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20170919.jpg?w=600&#038;h=400&#038;fit=crop&#038;crop=faces%2Cfocalpoint 600w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20170919.jpg?w=900&#038;h=600&#038;fit=crop&#038;crop=faces%2Cfocalpoint 900w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20170919.jpg?w=1200&#038;h=800&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1200w\" sizes=\"auto, (max-width: 1440px) 100vw, 1440px\"><\/figure><figcaption class=\"hds-caption padding-y-2\">\n<div class=\"hds-caption-text p-sm margin-0\">Cyanobacteria blooms turned Blue Mesa Reservoir green from September through November 2021, when water levels were among the lowest on record. The OLI (Operational Land Imager) on Landsat 8 captured this image (right) of a bloom on November 17, 2021, when the water was near its lowest level; the left image shows the same area on November 15, 2017, when water levels were closer to normal.<\/div>\n<div class=\"hds-credits\">NASA Earth Observatory \/ Lauren Dauphin<\/div>\n<\/figcaption><\/div>\n<\/div>\n<div class=\"bg-spacesuit-white width-2px\"><\/div>\n<div class=\"grid-col flex-3 padding-top-4 padding-bottom-4\">\n<div class=\"hds-media-wrapper margin-left-auto margin-right-auto\">\n<figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-cover \"><img decoding=\"async\" width=\"1440\" height=\"960\" src=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117.jpg?w=1440&#038;h=960&#038;fit=clip&#038;crop=faces%2Cfocalpoint\" class=\"attachment-medium_large size-medium_large\" alt=\"The second image in the pair shows the same part of the reservoir in November 2021, when water levels were much lower and its color was much greener.\" block_context=\"nasa-block\" loading=\"lazy\" srcset=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117.jpg?w=1440&#038;h=960&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1440w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117.jpg?w=300&#038;h=200&#038;fit=crop&#038;crop=faces%2Cfocalpoint 300w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117.jpg?w=768&#038;h=512&#038;fit=crop&#038;crop=faces%2Cfocalpoint 768w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117.jpg?w=1024&#038;h=683&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1024w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117.jpg?w=400&#038;h=267&#038;fit=crop&#038;crop=faces%2Cfocalpoint 400w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117.jpg?w=600&#038;h=400&#038;fit=crop&#038;crop=faces%2Cfocalpoint 600w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117.jpg?w=900&#038;h=600&#038;fit=crop&#038;crop=faces%2Cfocalpoint 900w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117.jpg?w=1200&#038;h=800&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1200w\" sizes=\"auto, (max-width: 1440px) 100vw, 1440px\"><\/figure><figcaption class=\"hds-caption padding-y-2\">\n<div class=\"hds-caption-text p-sm margin-0\">Cyanobacteria blooms turned Blue Mesa Reservoir green from September through November 2021, when water levels were among the lowest on record. The OLI (Operational Land Imager) on Landsat 8 captured this image (right) of a bloom on November 17, 2021, when the water was near its lowest level; the left image shows the same area on November 15, 2017, when water levels were closer to normal.<\/div>\n<div class=\"hds-credits\">NASA Earth Observatory \/ Lauren Dauphin<\/div>\n<\/figcaption><\/div>\n<\/div>\n<div class=\"curtain-view-label-wrapper curtain-view-before\">\n\t\t\t\t\t\t<span class=\"curtain-view-label\"><br \/>\n\t\t\t\t\t\t\tNovember 15, 2017\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n<div class=\"curtain-view-label-wrapper curtain-view-after\">\n\t\t\t\t\t\t<span class=\"curtain-view-label\"><br \/>\n\t\t\t\t\t\t\tNovember 17, 2021\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n<\/div>\n<\/div>\n<p>\t\t\t<!-- Under image content --><\/p>\n<div class=\"grid-row flex-row title-row padding-x-2 desktop:padding-x-0 padding-top-2\">\n<div class=\"grid-col-12 tablet:grid-col-6\"><\/div>\n<div class=\"grid-col-12 tablet:grid-col-6 button-row margin-bottom-3 tablet:margin-bottom-0\">\n\t\t\t\t\t<!-- Update onClick handlers --><br \/>\n\t\t\t\t\t<button aria-label=\"Curtain view\" class=\"comparison-view curtain-view-button comparison-view-active padding-bottom-1 margin-left-1\">Curtain<\/button><button aria-label=\"Toggle view\" class=\"comparison-view toggle-view-button padding-bottom-1 margin-left-1\">Toggle<\/button><button aria-label=\"Two-Up view\" class=\"comparison-view two-up-view-button padding-bottom-1 margin-left-1\">2-Up<\/button>\t\t\t\t<\/div>\n<\/div>\n<\/div>\n<p>\t\t<!-- Image detail area --><\/p>\n<div class=\"image-details-panel padding-x-0\">\n<div class=\"before-after-details-divider padding-y-2\">\n\t\t\t\t\t<!-- OnClick handleImageDetailsClick --><button class=\"image-details-toggle-button\"><span>Image Details<\/span><!-- style - if showImageDetails, then transform rotate(180deg), else none --><svg aria-hidden=\"true\" width=\"14\" height=\"15\" viewbox=\"0 0 14 15\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><circle cx=\"7\" cy=\"7.5\" r=\"6.5\" stroke=\"#58585B\"><\/circle><path fill-rule=\"evenodd\" clip-rule=\"evenodd\" d=\"M7.0002 8.23854L9.26318 5.95996L9.80019 6.50067L7.0002 9.31996L4.2002 6.50067L4.73721 5.95996L7.0002 8.23854Z\" fill=\"#58585B\"><\/path><\/svg><\/button>\n\t\t\t\t<\/div>\n<p>\t\t\t\t<!-- if showImageDetails, then display --><\/p>\n<div class=\" padding-x-0\">\n<div class=\"grid-row\">\n<div class=\"grid-col flex-2\">\n<div class=\"image-details-wrapper\">\n\t\t\t\t\t\t\t\tCyanobacteria blooms turned Blue Mesa Reservoir green from September through November 2021, when water levels were among the lowest on record. The <a href=\"https:\/\/science.nasa.gov\/mission\/landsat\/oli\/\" rel=\"noopener\">OLI<\/a> (Operational Land Imager) on <a href=\"https:\/\/science.nasa.gov\/mission\/landsat-8\/\" rel=\"noopener\">Landsat 8<\/a> captured this image (right) of a bloom on November 17, 2021, when the water was near its lowest level; the left image shows the same area on November 15, 2017, when water levels were closer to normal.\t\t\t\t\t\t\t<\/div>\n<p>\t\t\t\t\t\t\t<!-- File List --><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p>The summers of 2021 and 2022 were tough seasons for Colorado\u2019s Blue Mesa Reservoir. <a href=\"https:\/\/science.nasa.gov\/earth\/earth-observatory\/drought-conditions-continue-in-spring-2021-148123\/\" rel=\"noopener\">A severe drought<\/a> gripped much of the western U.S., prompting emergency water releases that brought the reservoir to its lowest level <a href=\"https:\/\/data.usbr.gov\/time-series\/output?dd=19651130-20260701&#038;id=78.19651130-20260630&#038;it=78&#038;lo=1533&#038;v=1\" rel=\"noopener\">since 1984<\/a>. Marinas and boat ramps closed, remnants of a <a href=\"https:\/\/www.cpr.org\/show-segment\/as-the-blue-mesa-reservoir-dries-out-a-forgotten-small-town-reemerges\/\" rel=\"noopener\">ghost town<\/a> emerged from the muck, and parts of the reservoir turned greenish and swirled with toxic <a href=\"https:\/\/www.sciencedirect.com\/topics\/agricultural-and-biological-sciences\/cyanobacteria\" rel=\"noopener\">cyanobacteria<\/a> blooms.<\/p>\n<p><a href=\"https:\/\/www.usgs.gov\/publications\/environmental-characterization-blue-mesa-reservoir-and-potential-causes-and-management\" rel=\"noopener\">Research<\/a> conducted by scientists at the U.S. Geological Survey and the National Park Service analyzed decades of Blue Mesa Reservoir data and found a connection between low water levels, warm water temperatures, and harmful blooms.<\/p>\n<p>\u201cAlgal blooms were more common when water levels were below 7,470 feet and water temperatures were above approximately 19.5 degrees Celsius (67.1 degrees Fahrenheit),\u201d said Tyler King, a research hydrologist with U.S. Geological Survey. Water levels that low are relatively common and have occurred every few years in recent decades. \u00a0<\/p>\n<p>While some cyanobacteria, also called blue-green algae, are always present in the reservoir in small numbers, problems occur when certain types proliferate. <em>Aphanizomenon<\/em>, <em>Dolichospermum<\/em>, and <em>Woronichinia<\/em>, for instance, thrive when the reservoir\u2019s waters become warm and stagnant, releasing a toxin called <a href=\"https:\/\/www.epa.gov\/national-aquatic-resource-surveys\/indicators-cyanotoxins-microcystin\" rel=\"noopener\">microcystin<\/a> that can cause skin and eye irritation, respiratory problems, and liver damage. Children and pets are particularly vulnerable to microcystin poisoning because of their size and tendency to ingest more water than adults.<\/p>\n<p>King and colleagues analyzed in situ water samples and <a href=\"https:\/\/doi.org\/10.1111\/1752-1688.70038\" rel=\"noopener\">satellite observations<\/a> from the European Space Agency\u2019s <a href=\"https:\/\/www.esa.int\/Applications\/Observing_the_Earth\/Copernicus\/Sentinel-2\" rel=\"noopener\">Sentinel-2<\/a> mission and the NASA\/U.S. Geological Survey <a href=\"https:\/\/science.nasa.gov\/mission\/landsat\/\" data-type=\"link\" data-id=\"https:\/\/science.nasa.gov\/mission\/landsat\/\" rel=\"noopener\">Landsat<\/a> satellites. A Sentinel-2 sensor that detects the light-harvesting pigment <a href=\"https:\/\/science.nasa.gov\/earth\/earth-observatory\/global-maps\/chlorophyll\/\" rel=\"noopener\">chlorophyll<\/a> was particularly useful for mapping the blooms, while Landsat sensors were used to map water temperatures over time.<\/p>\n<p>The National Park Service and U.S. Geological Survey launched the project in 2021 after anecdotal reports and water sampling suggested elevated cyanobacteria concentrations, King said. The scientists collected water samples but also turned to historical records and <a href=\"https:\/\/doi.org\/10.1111\/1752-1688.70038\" data-type=\"link\" data-id=\"https:\/\/doi.org\/10.1111\/1752-1688.70038\" rel=\"noopener\">satellite data<\/a>\u2014\u201dlike a time machine,\u201d he said\u2014to examine conditions before regular water sampling had begun. Their analysis included satellite records of chlorophyll levels that extended back to 2016 and temperature records that reached back to 2000. The research team also studied in situ data on water levels dating to the 1970s.<\/p>\n<div class=\"hds-media hds-module wp-block-image\">\n<div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\">\n<div class=\"hds-media-wrapper margin-left-auto margin-right-auto\">\n<figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-contain-16x9 \"><a href=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesaphoto2.jpg?w=1127&#038;h=845&#038;fit=clip&#038;crop=faces%2Cfocalpoint\" rel=\"noopener\"><img decoding=\"async\" width=\"1127\" height=\"845\" src=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesaphoto2.jpg?w=1127&#038;h=845&#038;fit=clip&#038;crop=faces%2Cfocalpoint\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"A photograph taken from a rocky shoreline along the Iola Basin show mats of green growth coating the surface of the water.\" block_context=\"nasa-block\" loading=\"lazy\" srcset=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesaphoto2.jpg?w=1127&#038;h=845&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1127w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesaphoto2.jpg?w=300&#038;h=225&#038;fit=crop&#038;crop=faces%2Cfocalpoint 300w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesaphoto2.jpg?w=768&#038;h=576&#038;fit=crop&#038;crop=faces%2Cfocalpoint 768w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesaphoto2.jpg?w=1024&#038;h=768&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1024w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesaphoto2.jpg?w=400&#038;h=300&#038;fit=crop&#038;crop=faces%2Cfocalpoint 400w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesaphoto2.jpg?w=600&#038;h=450&#038;fit=crop&#038;crop=faces%2Cfocalpoint 600w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesaphoto2.jpg?w=900&#038;h=675&#038;fit=crop&#038;crop=faces%2Cfocalpoint 900w\" sizes=\"auto, (max-width: 1127px) 100vw, 1127px\"><\/a><\/figure><figcaption class=\"hds-caption padding-y-2\">\n<div class=\"hds-caption-text p-sm margin-0\">A cyanobacteria bloom turned the water surface of Iola Basin green on September 8, 2021. Photo by Nicole Gibney\/National Park Service.<\/div>\n<\/figcaption><\/div>\n<\/div>\n<\/div>\n<p>The satellite data showed that blooms typically start in the eastern end of the reservoir, an area known as Iola Basin. The basin, where the Gunnison River flows into the reservoir, is the shallowest part of the reservoir. Occasionally, the satellite data showed, blooms spread westward into other parts of the reservoir, sometimes moving about two-thirds of the way across. However, concentrations of toxins rarely reached levels that posed health concerns beyond Iola Basin.<\/p>\n<p>The same dynamics that caused challenges for Blue Mesa in 2021 and 2022 are present in 2026, said King. Drought again plagues much of the western U.S., the mountains hold <a href=\"https:\/\/science.nasa.gov\/earth\/earth-observatory\/snow-is-scarce-in-the-upper-colorado-basin\/\" rel=\"noopener\">little snow<\/a>, and water levels in Blue Mesa are <a href=\"https:\/\/water.sec.usace.army.mil\/overview\/spk\/locations\/blue%20mesa\" rel=\"noopener\">low<\/a>. On June 27, 2026, the reservoir stored about <a href=\"https:\/\/usbr.maps.arcgis.com\/apps\/dashboards\/81aaec3e74024ce6b9a5e50caa20984e\" rel=\"noopener\">43 percent<\/a> of the water it typically does on that date, the lowest value observed for that day in the past 30 years. Water levels are expected to continue dropping until October, according to <a href=\"https:\/\/www.usbr.gov\/lc\/region\/g4000\/24mo\/2026\/MAY26.pdf\" rel=\"noopener\">U.S. Bureau of Reclamation projections<\/a>.\u00a0<\/p>\n<p>If cyanobacteria blooms emerge in 2026, the researchers expect that satellites will help scientists track them. The researchers use the U.S. Geological Survey\u2019s <a href=\"https:\/\/www.usgs.gov\/mission-areas\/water-resources\/science\/watermap-water-monitoring-above-planet\" rel=\"noopener\">WaterMAP<\/a> (Water Monitoring Above the Planet) tool to monitor for potential bloom conditions within hours of satellite overpasses. NASA\u2019s <a href=\"https:\/\/ladsweb.modaps.eosdis.nasa.gov\/stream\/\" rel=\"noopener\">STREAM<\/a> (Satellite-based Tool for Rapid Evaluation of Aquatic Environments) project also uses data from Landsat and Sentinel-2 to map potential blooms within hours of a satellite overpass, and the multi-agency <a href=\"https:\/\/qed.epa.gov\/cyanweb\/account\" rel=\"noopener\">CyAN<\/a> (Cyanobacteria Assessment Network) project collects daily data from other satellites to map blooms in larger water bodies.<\/p>\n<p>\u201cIt\u2019s amazing that we can use satellites to map the impacts of microscopic organisms from almost 500 miles away,\u201d King said. Yet it will still be crucial to get people out on the water taking samples and directly testing for toxins, he emphasized. \u201cThe satellites aren\u2019t definitive,\u201d he added. \u201cThey can tell us where there <em>might <\/em>be a problem, but toxins often aren\u2019t present until the later stages of a bloom.\u201d<\/p>\n<div class=\"hds-media hds-module wp-block-image\">\n<div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\">\n<div class=\"hds-media-wrapper margin-left-auto margin-right-auto\">\n<figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-contain-16x9 \"><a href=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesaphoto1.jpeg?w=1512&#038;h=2016&#038;fit=clip&#038;crop=faces%2Cfocalpoint\" rel=\"noopener\"><img decoding=\"async\" width=\"1512\" height=\"2016\" src=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesaphoto1.jpeg?w=1512&#038;h=2016&#038;fit=clip&#038;crop=faces%2Cfocalpoint\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"A photograph shows two female researchers collecting green, algae-rich water in a cylindrical container.\" block_context=\"nasa-block\" loading=\"lazy\" srcset=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesaphoto1.jpeg?w=1512&#038;h=2016&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1512w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesaphoto1.jpeg?w=225&#038;h=300&#038;fit=crop&#038;crop=faces%2Cfocalpoint 225w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesaphoto1.jpeg?w=768&#038;h=1024&#038;fit=crop&#038;crop=faces%2Cfocalpoint 768w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesaphoto1.jpeg?w=1152&#038;h=1536&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1152w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesaphoto1.jpeg?w=300&#038;h=400&#038;fit=crop&#038;crop=faces%2Cfocalpoint 300w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesaphoto1.jpeg?w=450&#038;h=600&#038;fit=crop&#038;crop=faces%2Cfocalpoint 450w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesaphoto1.jpeg?w=675&#038;h=900&#038;fit=crop&#038;crop=faces%2Cfocalpoint 675w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesaphoto1.jpeg?w=900&#038;h=1200&#038;fit=crop&#038;crop=faces%2Cfocalpoint 900w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesaphoto1.jpeg?w=1500&#038;h=2000&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1500w\" sizes=\"auto, (max-width: 1512px) 100vw, 1512px\"><\/a><\/figure><figcaption class=\"hds-caption padding-y-2\">\n<div class=\"hds-caption-text p-sm margin-0\">Satellite observations can help managers decide where to send personnel to collect water samples for more detailed analysis of bloom toxicity. Photo by Katie Walton-Day\/USGS.<\/div>\n<\/figcaption><\/div>\n<\/div>\n<\/div>\n<div aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<p><em>NASA Earth Observatory images by Michala Garrison, using Landsat data from the\u00a0<\/em><a href=\"http:\/\/earthexplorer.usgs.gov\/\" rel=\"noopener\"><em>U.S. Geological Survey<\/em><\/a><em>. Photos by Katie Walton-Day (USGS) and Nicole Gibney (NPS). Story by Adam Voiland.<\/em><\/p>\n<div class=\"hds-featured-file-list bg-spacesuit-white padding-x-2 tablet:padding-x-3 desktop:padding-x-4 padding-y-5 desktop:padding-y-6 hds-module align wp-block-nasa-blocks-file-list\">\n<div class=\"grid-container grid-container-block padding-0\">\n<div class=\"grid-row width-full margin-bottom-4\">\n<div class=\"grid-col-12 desktop:grid-col-6 margin-bottom-2 desktop:margin-bottom-0\">\n<h2 role=\"textbox\" class=\"heading-22\">\n\t\t\t\t\tDownloads\t\t\t\t<\/h2>\n<\/div>\n<div class=\"grid-col-12 desktop:grid-col-6\">\n<div class=\"desktop:grid-col display-flex flex-align-center desktop:flex-justify-end\">\n\t\t\t\t\t\t\t\t\t<\/div>\n<\/div>\n<\/div>\n<div class=\"hds-list-row hds-file-list-row\">\n<div class=\"hds-list-thumbnail hds-file-list-thumbnail\">\n<div class=\"hds-list-thumbnail-inner hds-file-list-thumbnail-inner hds-cover-wrapper\">\n<figure class=\"hds-media-background  \"><img decoding=\"async\" width=\"5443\" height=\"3490\" src=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20171115_lrg.jpg?w=5443&#038;h=3490&#038;fit=clip&#038;crop=faces%2Cfocalpoint\" class=\"attachment-thumbnail size-thumbnail\" alt=\"The first of a pair of satellite images shows the reservoir in November 2017, when water levels were relatively high and its color was mostly blue.\" block_context=\"nasa-block\" loading=\"lazy\" data-video-loop=\"\" srcset=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20171115_lrg.jpg?w=5443&#038;h=3490&#038;fit=crop&#038;crop=faces%2Cfocalpoint 5443w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20171115_lrg.jpg?w=300&#038;h=192&#038;fit=crop&#038;crop=faces%2Cfocalpoint 300w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20171115_lrg.jpg?w=768&#038;h=492&#038;fit=crop&#038;crop=faces%2Cfocalpoint 768w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20171115_lrg.jpg?w=1024&#038;h=657&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1024w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20171115_lrg.jpg?w=1536&#038;h=985&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1536w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20171115_lrg.jpg?w=2048&#038;h=1313&#038;fit=crop&#038;crop=faces%2Cfocalpoint 2048w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20171115_lrg.jpg?w=400&#038;h=256&#038;fit=crop&#038;crop=faces%2Cfocalpoint 400w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20171115_lrg.jpg?w=600&#038;h=385&#038;fit=crop&#038;crop=faces%2Cfocalpoint 600w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20171115_lrg.jpg?w=900&#038;h=577&#038;fit=crop&#038;crop=faces%2Cfocalpoint 900w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20171115_lrg.jpg?w=1200&#038;h=769&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1200w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20171115_lrg.jpg?w=2000&#038;h=1282&#038;fit=crop&#038;crop=faces%2Cfocalpoint 2000w\" sizes=\"auto, (max-width: 5443px) 100vw, 5443px\"><\/figure>\n<\/div>\n<\/div>\n<div class=\"hds-list-details\">\n<div class=\"hds-list-name hds-file-list-name\">\n<h2 class=\"heading-22\">November 15,  2017<\/h2>\n<\/div>\n<div class=\"hds-list-meta\">\n<div class=\"hds-list-meta-item hds-list-date hds-file-list-date\">\n<p class=\"p-sm\">\n<\/div>\n<div class=\"hds-list-meta-item hds-file-list-filetype\">\n<p class=\"p-sm\">JPEG (8.98 MB)<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"hds-list-cta hds-file-list-download\">\n\t\t\t\t\t<a href=\"https:\/\/assets.science.nasa.gov\/content\/dam\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20171115_lrg.jpg\" target=\"_blank\" download rel=\"noopener\"><br \/>\n\t\t\t\t\t\t<svg width=\"32\" height=\"32\" viewbox=\"0 0 32 32\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><circle cx=\"16\" cy=\"16.0001\" r=\"16\" fill=\"#1C67E3\"><\/circle><path d=\"M15.2357 8.00007L15.2357 16.4829L11.9504 13.4078L10.8801 14.4094L16.0001 19.2001L21.1201 14.4094L20.0499 13.4078L16.7645 16.4829L16.7645 8.00007L15.2357 8.00007Z\" fill=\"white\"><\/path><path fill-rule=\"evenodd\" clip-rule=\"evenodd\" d=\"M9.6 20.8001V18.4001H8V22.4001H24V18.4001H22.4V20.8001H9.6Z\" fill=\"white\"><\/path><\/svg><br \/>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n<\/div>\n<div class=\"hds-list-row hds-file-list-row\">\n<div class=\"hds-list-thumbnail hds-file-list-thumbnail\">\n<div class=\"hds-list-thumbnail-inner hds-file-list-thumbnail-inner hds-cover-wrapper\">\n<figure class=\"hds-media-background  \"><img decoding=\"async\" width=\"5443\" height=\"3490\" src=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117_lrg.jpg?w=5443&#038;h=3490&#038;fit=clip&#038;crop=faces%2Cfocalpoint\" class=\"attachment-thumbnail size-thumbnail\" alt=\"The second image in the pair shows the same part of the reservoir in November 2021, when water levels were much lower and its color was much greener.\" block_context=\"nasa-block\" loading=\"lazy\" data-video-loop=\"\" srcset=\"https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117_lrg.jpg?w=5443&#038;h=3490&#038;fit=crop&#038;crop=faces%2Cfocalpoint 5443w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117_lrg.jpg?w=300&#038;h=192&#038;fit=crop&#038;crop=faces%2Cfocalpoint 300w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117_lrg.jpg?w=768&#038;h=492&#038;fit=crop&#038;crop=faces%2Cfocalpoint 768w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117_lrg.jpg?w=1024&#038;h=657&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1024w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117_lrg.jpg?w=1536&#038;h=985&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1536w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117_lrg.jpg?w=2048&#038;h=1313&#038;fit=crop&#038;crop=faces%2Cfocalpoint 2048w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117_lrg.jpg?w=400&#038;h=256&#038;fit=crop&#038;crop=faces%2Cfocalpoint 400w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117_lrg.jpg?w=600&#038;h=385&#038;fit=crop&#038;crop=faces%2Cfocalpoint 600w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117_lrg.jpg?w=900&#038;h=577&#038;fit=crop&#038;crop=faces%2Cfocalpoint 900w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117_lrg.jpg?w=1200&#038;h=769&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1200w, https:\/\/assets.science.nasa.gov\/dynamicimage\/assets\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117_lrg.jpg?w=2000&#038;h=1282&#038;fit=crop&#038;crop=faces%2Cfocalpoint 2000w\" sizes=\"auto, (max-width: 5443px) 100vw, 5443px\"><\/figure>\n<\/div>\n<\/div>\n<div class=\"hds-list-details\">\n<div class=\"hds-list-name hds-file-list-name\">\n<h2 class=\"heading-22\">November 17, 2021<\/h2>\n<\/div>\n<div class=\"hds-list-meta\">\n<div class=\"hds-list-meta-item hds-list-date hds-file-list-date\">\n<p class=\"p-sm\">\n<\/div>\n<div class=\"hds-list-meta-item hds-file-list-filetype\">\n<p class=\"p-sm\">JPEG (8.46 MB)<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"hds-list-cta hds-file-list-download\">\n\t\t\t\t\t<a href=\"https:\/\/assets.science.nasa.gov\/content\/dam\/science\/esd\/eo\/images\/iotd\/2026\/examining-algal-blooms-in-blue-mesa\/bluemesablooms_oli_20211117_lrg.jpg\" target=\"_blank\" download rel=\"noopener\"><br \/>\n\t\t\t\t\t\t<svg width=\"32\" height=\"32\" viewbox=\"0 0 32 32\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><circle cx=\"16\" cy=\"16.0001\" r=\"16\" fill=\"#1C67E3\"><\/circle><path d=\"M15.2357 8.00007L15.2357 16.4829L11.9504 13.4078L10.8801 14.4094L16.0001 19.2001L21.1201 14.4094L20.0499 13.4078L16.7645 16.4829L16.7645 8.00007L15.2357 8.00007Z\" fill=\"white\"><\/path><path fill-rule=\"evenodd\" clip-rule=\"evenodd\" d=\"M9.6 20.8001V18.4001H8V22.4001H24V18.4001H22.4V20.8001H9.6Z\" fill=\"white\"><\/path><\/svg><br \/>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n<\/div>\n<\/div>\n<\/div>\n<h2 class=\"wp-block-heading\">References &#038; Resources <\/h2>\n<ul class=\"wp-block-list\">\n<li>Aspen Journalism (2026, January 9) <a href=\"https:\/\/aspenjournalism.org\/low-reservoir-levels-main-cause-of-toxic-algae-in-blue-mesa\/\" rel=\"noopener\">Low reservoir levels main cause of toxic algae in Blue Mesa<\/a>. Accessed July 1, 2026.<\/li>\n<li>Aspen Journalism (2021, September 4) <a href=\"https:\/\/aspenjournalism.org\/blue-mesa-reservoir-releases-impacting-lake-recreation\/\" rel=\"noopener\">Blue Mesa Reservoir releases to prop up Lake Powell impacting recreation<\/a>. Accessed July 1, 2026.<\/li>\n<li>CPR News (2021, September 3) <a href=\"https:\/\/www.cpr.org\/2021\/09\/03\/blue-mesa-reservoir-lake-powell-water-supply-drought\/\" rel=\"noopener\">Drought-Hit Blue Mesa Reservoir Losing 8 Feet Of Water To Save Lake Powell<\/a>. Accessed July 1, 2026.<\/li>\n<li><em>The Colorado Sun<\/em> (2023, June 16) <a href=\"https:\/\/coloradosun.com\/2023\/06\/16\/blue-mesa-water-level-photos-2021-2023\" rel=\"noopener\">Side-by-side photos show how much Blue Mesa Reservoir\u2019s water levels have risen thanks to this winter\u2019s snow<\/a>. Accessed July 1, 2026.<\/li>\n<li><em>The Colorado Sun<\/em> (2022, September 22) <a href=\"https:\/\/coloradosun.com\/2022\/09\/23\/blue-green-algae-toxic-blue-mesa\/\" rel=\"noopener\">At Colorado\u2019s largest reservoir, one national park scientist shifts her focus to toxic algae<\/a>. Accessed July 1, 2026.<\/li>\n<li>Environmental Protection Agency (2026, January 5) <a href=\"https:\/\/www.epa.gov\/national-aquatic-resource-surveys\/indicators-cyanotoxins-microcystin\" rel=\"noopener\">Cyanotoxins (microcystin)<\/a>. Accessed May 28, 2026.<\/li>\n<li>King,\u00a0T. V.,\u00a0 <em>et al.<\/em> (2025) <a href=\"https:\/\/doi.org\/10.1111\/1752-1688.70038\" rel=\"noopener\">Remote Sensing of Chlorophyll a and Temperature to Support Algal Bloom Monitoring in Blue Mesa Reservoir, Colorado<\/a>.\u00a0<em>JAWRA Journal of the American Water Resources Association, <\/em>61(4), e70038.\u00a0<\/li>\n<li>National Park Service (2026) <a href=\"https:\/\/www.nps.gov\/cure\/planyourvisit\/reservoir_levels.htm\" rel=\"noopener\">Reservoir Levels<\/a>. Accessed July 1, 2026.<\/li>\n<li>U.S. Bureau of Reclamation (2026) <a href=\"https:\/\/www.usbr.gov\/rsvrWater\/rsv40Day.html?siteid=913&#038;reservoirtype=Reservoir\" rel=\"noopener\">Blue Mesa Reservoir<\/a>. Accessed July 1, 2026.<\/li>\n<li>U.S. Bureau of Reclamation (2026) <a href=\"https:\/\/usbr.maps.arcgis.com\/apps\/dashboards\/81aaec3e74024ce6b9a5e50caa20984e\" rel=\"noopener\">Reservoir Storage Dashboard<\/a>. Accessed July 1, 2026.<\/li>\n<li>University of Colorado Boulder (2026, January 26) <a href=\"https:\/\/waterdesk.org\/2026\/01\/low-reservoir-levels-main-cause-of-toxic-algae-in-blue-mesa\/\" rel=\"noopener\">Low reservoir levels main cause of toxic algae in Blue Mesa<\/a>. Accessed May 28, 2026.<\/li>\n<li>U.S. Drought Monitor (2026, May 28) <a href=\"https:\/\/droughtmonitor.unl.edu\/CurrentMap\/StateDroughtMonitor.aspx?CO\" rel=\"noopener\">Colorado<\/a>. Accessed July 1, 2026.<\/li>\n<li>Walton-Day, K., <em>et al.<\/em> (2025) <a href=\"https:\/\/doi.org\/10.3133\/sir20255109\" rel=\"noopener\">Environmental Characterization of Blue Mesa Reservoir and Potential Causes of and Management Strategies for Harmful Algal Blooms, 1970 through 2023, Curecanti National Recreation Area, Colorado<\/a>. <em>U.S. Geological Survey Scientific Investigations Report, <\/em>2025\u20135109.<\/li>\n<\/ul>\n<div class=\"hds-content-lists-inner hds-module hds-module-full alignfull wp-block-nasa-blocks-content-lists\">\n<div class=\"hds-content-lists margin-y-3 padding-x-0 bg-spacesuit-white width-full maxw-full\" data-starting-query=\"{\" block_id data-current-query=\"{\">\n<div class=\"grid-container grid-container-widescreen padding-x-3\">\n<div class=\"grid-row flex-align-start margin-bottom-3\">\n<div class=\"desktop:grid-col-8 margin-bottom-2 desktop:margin-bottom-0\">\n<h2 class=\"section-heading-sm line-height-sm\">You may also be interested 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https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=200&#038;h=200&#038;fit=crop&#038;crop=faces%2Cfocalpoint 200w, https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=400&#038;h=400&#038;fit=crop&#038;crop=faces%2Cfocalpoint 400w, https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=600&#038;h=600&#038;fit=crop&#038;crop=faces%2Cfocalpoint 600w, https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=900&#038;h=900&#038;fit=crop&#038;crop=faces%2Cfocalpoint 900w, https:\/\/images-assets.nasa.gov\/image\/NHQ202212160009\/NHQ202212160009~large.jpg?w=1200&#038;h=1200&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1200w\" sizes=\"auto, (max-width: 1920px) 100vw, 1920px\"><\/figure>\n<\/div>\n<p><\/a><br \/>\n\t\t\t\t\t<a href=\"https:\/\/science.nasa.gov\/earth\/data\/\" class=\"mobile:grid-col-12 tablet:grid-col-6 desktop:grid-col-3 topic-card margin-bottom-4 desktop:margin-bottom-0\" rel=\"noopener\"><\/p>\n<div class=\"hds-topic-card hds-cover-wrapper cover-hover-zoom bg-carbon-black\">\n<div class=\"skrim-overlay skrim-overlay-dark skrim-left mobile-skrim-top padding-3 display-flex flex-align-end flex-justify-start z-200\">\n<div>\n<h3 class=\"hds-topic-card-heading heading-29 color-spacesuit-white line-height-sm margin-top-0 margin-bottom-1\">\n\t\t\t\t\t\t\t\t<span>Earth Science Data<\/span><br \/>\n\t\t\t\t\t\t\t\t<svg viewbox=\"0 0 32 32\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><circle class=\"color-nasa-red\" cx=\"16\" cy=\"16\" r=\"16\"><\/circle><path d=\"M8 16.956h12.604l-3.844 4.106 1.252 1.338L24 16l-5.988-6.4-1.252 1.338 3.844 4.106H8v1.912z\" class=\"color-spacesuit-white\"><\/path><\/svg><br \/>\n\t\t\t\t\t\t\t<\/h3>\n<p class=\"margin-bottom-0 margin-top-2 color-carbon-20-important\">Open access to NASA\u2019s archive of Earth science data<\/p>\n<\/div>\n<\/div>\n<figure class=\"hds-media-background  \"><img decoding=\"async\" width=\"1536\" height=\"768\" src=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2023\/10\/biosphere-sea-2008-lrg.png?w=1536\" class=\"attachment-1536x1536 size-1536x1536\" alt=\"\" block_context=\"nasa-block\" loading=\"lazy\" srcset=\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2023\/10\/biosphere-sea-2008-lrg.png 3600w, https:\/\/science.nasa.gov\/wp-content\/uploads\/2023\/10\/biosphere-sea-2008-lrg.png?resize=300,150 300w, https:\/\/science.nasa.gov\/wp-content\/uploads\/2023\/10\/biosphere-sea-2008-lrg.png?resize=768,384 768w, https:\/\/science.nasa.gov\/wp-content\/uploads\/2023\/10\/biosphere-sea-2008-lrg.png?resize=1024,512 1024w, https:\/\/science.nasa.gov\/wp-content\/uploads\/2023\/10\/biosphere-sea-2008-lrg.png?resize=1536,768 1536w, https:\/\/science.nasa.gov\/wp-content\/uploads\/2023\/10\/biosphere-sea-2008-lrg.png?resize=2048,1024 2048w, https:\/\/science.nasa.gov\/wp-content\/uploads\/2023\/10\/biosphere-sea-2008-lrg.png?resize=400,200 400w, https:\/\/science.nasa.gov\/wp-content\/uploads\/2023\/10\/biosphere-sea-2008-lrg.png?resize=600,300 600w, https:\/\/science.nasa.gov\/wp-content\/uploads\/2023\/10\/biosphere-sea-2008-lrg.png?resize=900,450 900w, https:\/\/science.nasa.gov\/wp-content\/uploads\/2023\/10\/biosphere-sea-2008-lrg.png?resize=1200,600 1200w, https:\/\/science.nasa.gov\/wp-content\/uploads\/2023\/10\/biosphere-sea-2008-lrg.png?resize=2000,1000 2000w\" sizes=\"auto, (max-width: 1536px) 100vw, 1536px\"><\/figure>\n<\/div>\n<p><\/a>\n\t\t\t\t<\/div>\n<\/div>\n<\/div>\n<p class=\"wpematico_credit\"><small>Powered by <a href=\"http:\/\/www.wpematico.com\" target=\"_blank\">WPeMatico<\/a><\/small><\/p>\n<p><a href=\"https:\/\/science.nasa.gov\/earth\/earth-observatory\/examining-algal-blooms-in-blue-mesa\/\" target=\"_blank\" rel=\"noopener\">Get The Details&#8230;<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Using satellite data, researchers connected harmful algal blooms with warm water and 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