Technical Report
 

State-wide fishery rehabilitation, Upper Cow Lake and tributaries segment

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https://ir.library.oregonstate.edu/concern/technical_reports/rf55z8698

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  • Upper Cow Lake located in Malheur County, Oregon, Township 28 South, Range 44 East, Section 29, was chemically treated with 2,325 gallons of liquid synergized rotenone (Pro-noxfish) on September 11, 1963 to remove an abundant population of rough fish. The lake has a maximum surface area of 975 acres and a volume of 7,150 acre-feet. Samples of fish killed after chemical treatment included coarsescale suckers 69.2 per cent, squawfish 24.5 per cent, redside shiners 3.0 per cent, black bullhead 2.0 per cent and bridgelip suckers 1.3 per cent. Chemical treatment of approximately 55 miles of tributary streams above Upper Cow Lake was completed in August and September, 1963. Twelve miles of tributary streams located in Idaho were treated by the Idaho Game Department personnel. Restocking of the lake with rainbow trout will begin in 1964. Very little of the tributary system is suitable for restocking of game fish.
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