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Quality of Water Colorado River Basin

Quality of Water Colorado River Basin

Real-time computed concentrations of water-quality constituents such as suspended sediment, total nitrogen, and total phosphorus are calculated using ordinary least squares regression models. The results of these models, along with direct water-quality measurements, can be viewed here as time-series graphs, or downloaded as tabular data.

Ordinary least squares regression models on this site use conventional sensor measurements (for example, discharge, temperature, pH, specific conductance, turbidity, and dissolved oxygen) to compute concentrations and loads of other water-quality constituents in real time. This makes it possible to compute instantaneous values of many constituents in real time for public safety without the lengthy time delay of collecting a sample and waiting for analysis of a sample at a laboratory.

Please select a site from below to start viewing data. You also can read more about the methods, measured constituents, and disclaimers by using the navigation bar at the top of each page.

Map Legend


Continuous Water-Quality Gage
Discontinued Continuous Water-Quality Gage
Station Name Station Identifier County Computation Period
Colorado River above Glenwood Springs, CO 09071750 Garfield Jan. 2013 to present
Colorado River above Imperial Dam, AZ-CA 09429490 Imperial Jan. 2014 to present
Colorado River at Lees Ferry, AZ 09380000 Coconino Jan. 2013 to present
Colorado River below Glenwood Springs, CO 09085100 Garfield Jan. 2014 to present
Colorado River below Hoover Dam, AZ-NV 09421500 Clark Jan. 2014 to present
Colorado River Below Parker Dam, AZ-CA 09427520 San Bernardino Jan. 2014 to present
Colorado River near Cameo, CO 09095500 Mesa Jan. 2013 to present
Colorado River near Cisco, UT 09180500 Grand Jan. 2013 to present
Colorado River near Grand Canyon, AZ 09402500 Coconino Jan. 2013 to present
Dolores River near Cisco, UT 09180000 Grand Jan. 2013 to present
Duchesne River near Randlett, UT 09302000 Uintah Jan. 2013 to present
Green River at Green River, UT 09315000 Emery Jan. 2013 to present
Green River near Green River, WY 09217000 Sweetwater Jan. 2013 to present
Gunnison River near Grand Junction, CO 09152500 Mesa Jan. 2013 to present
San Juan river near Bluff, UT 09379500 San Juan Jan. 2013 to present
San Rafael River near Green River, UT 09328500 Emery Jan. 2013 to present
Virgin River at Littlefield, AZ 09415000 Mohave Jan. 2013 to present
White River near Watson, UT 09306500 Uintah Jan. 2013 to present
Yampa River near Maybell, CO 09251000 Moffat Jan. 2013 to present



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URL: http://nrtwq.usgs.gov/study/3000
Page Contact Information: National Real-Time Water Quality Information
Page Last Modified: Wed 06 October 2010