The chlorophyll-ɑ concentrations in the Reservoir exceeded the growing season standard for 2022.
The Reservoir chlorophyll-α growing season (July through September) concentration was 27.3 ug/L, which exceeds the 18 ug/L growing season standard. The seasonal mean concentration is measured in the upper three meters of the water column (photic zone), with an allowable exceedance frequency of once in five years. The Reservoir has exceeded the chlorophyll-α standard in four of the last five years, and eight of the last ten years.
Why Sample for Chlorophyll-α?
CCBWQA samples for chlorophyll-α because it can tell us about the amount of algae in the Reservoir, and high levels of algae may impact the Reservoir's beneficial uses. Chlorophyll-ɑ is also an enforceable water quality standard for the Reservoir that the Water Quality Control Division uses in its biennial assessment of water quality in the Reservoir.
Seasonal Mean Concentrations of Chlorophyll-a Measured in Cherry Creek Reservoir
Cherry Creek Reservoir Cholorophyll-a Drilldown
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- Select a season from the dropdown to see results from either summer or annual sampling.