WSPC04984

• File Number: 8541
• Description: San Luis Valley Project
• State: CO
• Basin: Rio Grande
• Water Division: 3
• Date: 3/30/1981
• Author: Robert H Weimer
• Title: San Luis Valley Project Closed Basin Division - 1980-1981 - Results of Mitigation Meeting of March 10, 1981 and proposed Mitigation Plan for the Closed Basin Division
• Water Supply Pro - Doc Type: Report/Study

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Duck. Production in San Luia Valley. Colorado =
1964-1978 !t <J7
Average mBber Esttllsted Percent total Percent total
Area size Acres of of breeding average annual wetland 1n production in Ducks producedl
Area !J acres 2/ wetland 11 pairs production SaR Luis Valley ~ San Luia Valley acre of wetland
(acres)
San Luis/Head Lakes 4,470 2,235 315 945 1.0 1.1 0.42
(I80-2,439)
Hiahak Lakea 2,570 1,285 253 759 0.6 0.9 0.59
(540-1,596) .
RUBsel1 Lakes 3,829 1,915 1,131 3.393 0.8 4.1 1.77
(489-1,845)
Adams Lakes 640 320 38 II4 0.1 0.1 0.35
(18-309)
Honte Vista NWR 14.836 6,900 3,861. 11,583 3.0 13.8 1.68
(9,000-13,260)
Total for high-
density breeding
a reBS 26,345 12,655 5.598 16,794 5.5 20.0 1.33
(11.808-19,575) 11
Low-density breeding
a rea 1/ . 805,655 218,345 24.402 67,206 94.5 80.0 0.31
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Total for
San LuIs Valley 832,000 231,000 28,000 84,000 100.0 10.0 0.36
Total for Closed
Basin project
8 rea !/ 130,000 43,122 4,540 13,620 18.6 16.2 0.31

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11 Breeding pair and area size data taken from Hopper et a1. (1975). Updated by personal communication Howard Funk 1981.
2/ Identification and delineation of low- and high-density breeding areas from Hopper et al. (1915).
11 Acreage estimate for high-density areas was based upon FWs estimate of wetland densities with Hopper et a1. (1915) study aress.
Acreage for Monte Vista NWR vaa taken from the refuge annual repOrts which indicated an average of 6,900 acres annually
available for duck production.
~I Annual production estimates assumed 50-percent nest success and 6 fledglings (class lIe-Ill) per brood.
Data supporting these figures came from studies on Konte Vista NWR (Anderson 1961, Poapahala 1969, Schroeder 1972, and Robinson 1971).
21 Range of production does not include 1964 when San Luis/Head, H1shak. and Adams Lakes were not surveyed by Hopper et al. (197S).
In 1965 Adams Lake was not surveyed.
!I Includes San Luts/Head Lakes from high-density breeding areas; data from Hlshak Lakes was not included but an unknown portion
of M1shak Lakes may be included in wetland acreage for Closed Basin project area.