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Table 3. Cost of Dyneema net evaluation, installation, and purchase, as a fish barrier on Highline Lake. Action Cost Evaluate net options, feasibility analyses, and engineering - AYRES $87,000 Coordination and administration - CRWCD $42,000 Dyneema net -Redden Nets $95,000 Installation -Ashley Construction $160,000 Funding for fish barrier net - UCRRP $384,000 Evaluation of net performance and effectiveness in controlling fish escapement (1999-2001) - CDOW $65,000 saturation". In conjunction with heavy wind and wave conditions, the main body of the net experienced a "maximum drag". The net was cleaned by State Parks in 2001 by raising portions above the water and washing with ahigh-pressure spray. Fish sampling and marking was performed in Highline Lake to evaluate fish escapement from the reservoir and downstream movement of nonnative fish toward the Colorado River. Fish captured in the reservoir in June of both 1999 (1,091 fish = 100% nonnative) and 2000 (1,420 = 99% nonnative) were measured and given a right pelvic fin clip (except trout) to denote their origin in the reservoir. The net's placement met the screening requirement in the Procedures for Stocking Nonnative Fish Species in the Upper Colorado River Basin (U.S. Fish and Wildlife Service 1996) and allowed the stocking of bluegill (15,000/yr.; 2 inches long), and largemouth bass (7,000/yr.; 4 inches long) into Highline Lake in 1999, 2000, 2001. All of the largemouth bass stocked into the reservoir each year were also marked with right pelvic fin clips. Electrofishing to evaluate the net's effectiveness in controlling fish escapement from the reservoir was conducted at four downstream sites: 1. Mack Wash below Highline Lake Dam; 2. Mack Wash near Root's Reservoir; 3. near Salt Creek confluence with Colorado River in 1999 (July-November); and 4. Salt Creek below I-70 in 2000 (May-November) and 2001 (May-October). Following the net's installation, few fish marked with a right pelvic clip were captured downstream of the reservoir in 1999 (4 of 714 = 0.5%), 2000 (8 of 1,566 = 0.5%), or 2001 (4 of 1,393 = 0.3%) (Table 4). These marked fish captured downstream of the reservoir included 4 green sunfish, 10 largemouth bass, and 1 yellow perch. The -sizes of the recaptured largemouth bass indicated that they most likely were from the fish stocked into the reservoir. While the number of largemouth bass captured in the reservoir nearly doubled from 1999 to 2000 (69 to 24