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Summaries of water-quality monitoring data are available for several major river basins in Colorado.
For each basin, current data from a network of sites are compared to previously collected data and instream standards. Lowess curves are provided on plots for selected constituents where a sufficient period of record and limited censored data are available.
Water-quality summaries are available for the following major river basins:
Arkansas River Basin, 1990-2019
Big Thompson River Basin, 2000-2019
Colorado River Basin, 1990-2019
Eagle River Basin, 1990-2018
Fraser River Basin, 1990-2018
Gunnison River Basin (Upper), 1995-2019
Gunnison River Basin (Lower), 1993-2019
White River Basin, 1992-2019
Yampa River Basin, 1990-2019