Concentrations and annual fluxes for selected water-quality constituents from the USGS National Stream Quality Accounting Network (NASQAN), 1996-2000

By Valerie J. Kelly, Richard P. Hooper, Brent T. Aulenbach, and Mary Janet

Sampling Coverage

Figures describing hydrographs and sampling coverage during 1996-2000 for each station can be viewed by clicking on the appropriate station name in the following list. The time period for sampling is defined by the begin date for the period of active sampling for the specific station (Table 1). A second plot on each figure depicts the sampling coverage as a function of the distribution of streamflow, plotted as rank in percent; for context with historic NASQAN water-quality data (where data are available), the distribution of streamflow during the period of historic NASQAN sampling is also presented on the same plot.

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Mississippi River Basin

• Ohio River at Greenup Dam near Greenup, Kentucky
• Ohio River at Cannelton Dam, Kentucky
• Wabash River at New Harmony, Indiana
• Tennessee River at Highway 60 near Paducah, Kentucky
• Ohio River at Lock & Dam 53 near Grand Chain, Illinois
• Missouri River near Culbertson, Montana
• Yellowstone River near Sidney, Montana
• Missouri River at Garrison Dam, North Dakota
• Missouri River at Pierre, South Dakota
• Missouri River at Omaha, Nebraska
• Platte River at Louisville, Nebraska
• Missouri River at Hermann, Missouri
• Mississippi River below Grafton, Missouri
• Mississippi River at Clinton, Iowa
• Mississippi River at Thebes, Illinois
• Arkansas River at David Terry Lock & Dam below Little Rock, Arkansas
• Mississippi River near St. Francisville, Louisiana
• Lower Atchafalaya River at Melville, Louisiana

Rio Grande Basin

• Rio Grande River at El Paso, Texas
• Rio Grande River at Foster Ranch near Langtry, Texas
• Pecos River near Langtry, Texas
• Rio Grande River below Amistad Reservoir near Del Rio, Texas
• Rio Grande River at Pipeline Crossing below Laredo, Texas
• Rio Grande River below Falcon Dam, Texas
• Arroyo Colorado River at Harlingen, Texas
• Rio Grande River near Brownsville, Texas

Colorado River Basin

• Colorado River near Cisco, Utah
• Green River at Green River, Utah
• San Juan River near Bluff, Utah
• Colorado River at Lees Ferry, Arizona
• Colorado River at Diamond Creek near Peach Springs, Arizona
• Colorado River below Hoover Dam, Arizona-Nevada
• Colorado River above Imperial Dam, Arizona
• Colorado River at NIB above Morelos Dam near Andrade, California

Columbia River Basin

• Columbia River at Northport, Washington
• Columbia River at Vernita Bridge near Priest Rapids Dam, Washington
• Snake River at Burbank, Washington
• Columbia River at Warrendale, Oregon
• Willamette River at Portland, Oregon
• Columbia River near Beaver Army Terminal near Quincy, Oregon

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