| As of fiscal year 2005,
the National Irrigation Water Quality Program
has been inactive.
For further information regarding the program,
please "Contact Us" via the link
at the top of this page.
NIWQP Project/Study Area—
Lower Colorado River Valley, Arizona - California
LocationThe Lower Colorado River study area includes the Colorado River and its environs from Davis Dam to just above Imperial Dam. The area includes parts of Yuma, La Paz, and Mohave counties, Arizona; Clark county, Nevada; and Imperial, Riverside and San Bernardino counties, California. (Detail map pdf)
StatusIrrigation drainage in the Lower Colorado River Valley does not appear to exacerbate selenium concentrations. The NIWQP is no longer involved at this location.
Phases 2 and 3 DataChemical Data From Water:
ASCII - 27 KB .dat File or Microsoft Excel - 107 KB .xls File
ASCII - 9 KB .dat File or Microsoft Excel - 48 KB .xls File
ASCII - 16 KB .dat File or Microsoft Excel - 67 KB .xls File
ASCII - 20 KB .dat File or Microsoft Excel - 59 KB .xls File
DocumentsSchroeder, R.A., Anders, R., and Fay, R.G., 1995, Binational chemical-quality assessment of the Lower Colorado and New Rivers: American Water Resources Association, 31st Annual Meeting, Houston, November 5-9, 1995, 1 p.
Radtke, D.B., and Kepner, W.G., 1990, Environmental contaminants in the lower Colorado River Valley, Arizona, California, and Nevada: in Symposium proceedings, Survival in the desert-Water quality and quantity issues into the 1990's-adaption to current realities; Arizona Hydrological Society, 21 pages.
Radtke, D.B., Kepner, W.G., and Effertz, R.J., 1988. Reconnaissance investigation of water quality, bottom sediment, and biota associated with irrigation drainage in the lower Colorado River Valley, Arizona, California, and Nevada, 1986-87: U.S. Geological Survey Water-Resources Investigations Report 88-4002, 77 p.