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The Cottonwood Creek study area, located in the Redding basin in northern California between Redding and Red Bluff, contains a network of surface-water sites and wells for monitoring surface-water quality and ground-water levels and quality. This network was established to provide baseline information on the ground-water conditions prior to the completion of two proposed dams, one to be located on Cottonwood Creek and one to be located on South Fork Cottonwood Creek. Analysis of monthly ground-water levels from September 1982 through October 1983 shows that water levels are lowest in the autumn and highest in the spring. The ground-water surface slopes to the east and has a mound near the town of Cottonwood at the Anderson-Cottonwood Irrigation District Canal. Further studies in this area would provide information needed for any subsequent modeling studies. Data are also insufficient in the area upstream from the damsites, specifically in the areas of future impoundment, so the monitoring network could be expanded to include wells in these areas. Comparison of ground-water quality samples from the period of lowest water levels to those collected during the period of highest water levels showed little chemical variation. Ground water is good to excellent with respect to recommended drinking-water standards. Chemical water types varied little throughout the area; ground water north of Cottonwood Creek is either sodium magnesium or magnesium sodium bicarbonate; south of Cottonwood Creek the predominant water type is calcium magnesium or magnesium calcium bicarbonate. Surface-water samples from Cottonwood Creek and South Fork Cottonwood Creek have water which is chemically similar to ground water from south of Cottonwood Creek.

Water-resources monitoring in the Cottonwood Creek area, Shasta and Tehama counties, California, 1982-83