WSPC05982

• File Number: 8541
• Description: San Luis Valley Project
• State: CO
• Basin: Rio Grande
• Water Division: 3
• Date: 6/1/1982
• Title: San Luis Valley Project Closed Basin Division - 1982 - Fish and Wildlife Report for the Closed Basin Division, San Luis Valley Project, Colorado
• Water Supply Pro - Doc Type: Report/Study

Table 1
Duck Production in San Luis Valley, Colorado
1964-1978 ~I
Average number Estimated Percent total Percent total
Area size Acres of of breeding average annual wetland in product Ion In Ducks producedl
~ll (acrea) 21 wetland 11 pairs production San Lul. Valley ~I San Luis Vslley acre of wetland
San Luta/Head Lakes 4,470 2,235 315 945 1.0 1.1 0.42
(180-2.439) )
Hlahak Lakes 2,570 1,285 253 759 0.6 0.9 0.59
(540-1.596)
Russell Lakes 3.829 1.915 1,131 3,393 0.8 4.1 1.77
(489-1.845)
Adams Lakes 640 320 38 114 0.1 0.1 0.35
(18-309)
Honte Viata NWR 14,227 6,900 ~ 11.583 3.0 13.8 1.68
(9,000-13,260)
Total for htgh-
density breeding
reas 26.345 12.655 5.598 16,794 5.5 20.0 1.33
(11.808-19.575) 11
Low-density breeding
a rea ~/ 805,655 218.345 24.402 67.206 94.5 80.0 0.31 ,
0:> ,
Total for
San Luis Valley 832,000 231,000 28.000 84.000 100.0 100.0 0.36
Total foe Closed
Baatn project
a rea ~ 130.000 43.122 4,540 13,620 18.6 16.2 0.31

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Breeding pair and area size data taken frOm Hopper et 81. (191;). Updated by personal communication Howard Funk 1981.
Identification and delineation of low- snd high-density breeding areas from Hopper et ale (1915).
Acreage estimate for high-density areas was based upon FWS!s estimate of wetland densities with Hopper et ale (197;) 6tudy areas.
Acreage for Honte Vista NWR was taken from the refuge annual reports which indicated an average of 6,900 acres annually
available far duck production.
Annual production estimates assumed 50-percent nest success and 6 fledglings per brood.
Data supporting these figures came from studies on Monte Vista NWR (Anderson 1961, Pospahala 1969, Schroeder 1972, and Robinson 1971).
Range of production does not include 1964 when San LUis/Head, Hlshak, and Adsms Lakes were not surveyed by Hopper et al. (1975).
In 1965 Adams Lake was not surveyed.
Includes San Luis/Head Lakes from high-density breeding 8reaSj data from Miahak Lakes was not included. but an unknown portion
of Hishak Lakes may be included 1n wetland acreage for project ares.

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