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WATER QUALITY STATUS REPORT, CONWAY GULCH, CANYON COUNTY, ID, 1981-1982
Description:
The ID Division of Environment (DOE) conducted a water quality survey of conway Gulch, Canyon County, ID (17050114) from April 1981 through March 1982. A total of 12,880 critical erosion acres are included in the drainage area of Conway Gulch. Baseline suspended sediment loadings for the mouth of Conway Gulch at Notus were 6,083 tons for an available database of 6 years. Suspended sediment was 4,41 tons for the period of this study and bedload sediment was 1,016 tons for a total sediment load of 5,247 tons at Notus. Conway Gulch discharged 9.8 tons of total phosphorus (50% directly attributed to agriculture) and 110 tons of inorganic nitrogen (21% directly attributed to agriculture) to the Lower Boise River during this study. The pesticides DDT and toxaphene were found in significant amounts in fish tissue. Bridgelip suckers, chiselmouth chubs, and rainbow trout were found in Conway Gulch but at lower numbers. Water Quality Series No. 49. William H. Clark and Stephen B. Bauer. ID Dept of Health and Welfare, Division of Environment, 1982. 59 pp.