National Irrigation Water Quality Program
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As of fiscal year 2005,
the National Irrigation Water Quality Program
has been inactive.

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NIWQP Project/Study Area—


Lower Colorado River Valley, Arizona - California

Location
The 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)


Status
Irrigation 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 Data
Chemical Data From Water:
ASCII - 27 KB .dat File  or  Microsoft Excel - 107 KB .xls File

Bottom Material:
ASCII - 9 KB .dat File  or  Microsoft Excel - 48 KB .xls File

Inorganic:
ASCII - 16 KB .dat File  or  Microsoft Excel - 67 KB .xls File

Organic:
ASCII - 20 KB .dat File  or  Microsoft Excel - 59 KB .xls File


Documents
Schroeder, 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.


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