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246 " . Col/bran Project 'Hydroelectric Power Two hydroelectric powerplant8 are in operation, with a combined installed capacity of 13,500 kilowatts. Recreation and Fish and Wildlife Construction and operation of the reservoirs have im- proved lake fisberies and wildlife values. Some minor damage to stream fisheries and wildlife value~ resulted from the reduction of flows downstream from storage or diversion structures and from in~ndation of some stream habitat in the Vega reservoir area. However, the net ef- fect is an increase in fish and wildlife. The Vega recrea- tion areas are administered by the Colorado Division of Parks and Outdoor Recreation. Fishing, camping, boating, picnicking, and sightseeing are the principal activities. In 1977, visitation totaled 62,871. PROJECT DATA Land Areas (19771 Irrigahle area: Full irrigation service................,.... SllPplemental irrigation senrice . . . . . . . . . . , . . Total,........"'.,.....,.,............ 2,500 acres 19,710 acres 22,210 acres Area Irrigated and Crop Value Area irrigated, Crop value. Year acres dollars 1968 19,542 982.%7 1969 19,888 1,]05,788 1970 19,397 1,119,246 1971 19,878 1,356,611 1972 19,880 1,322,321 1973 20,063 1,700,052 1974 20,110 1,749,042 1975 19,769 1,884,004 ]976 19,909 1,684,799 1977 19,843 ]684,877 ]Colorado River runoff in 1977 was the lowest in 61 years of record. In most areas of Colorado, precipitation for the year was consiqerably below average resulting in lower yields because of the extreme drought. Facilities in Operation Storage damslmain storage and rehabilita- tion) .............................. ... Diversion dams .............. ............ Canals.. ..... ... .......... ............. Powerplants .................... ...,.... Pipelines and penstocks.... ............... 18 3 37 mi 2 18 mi 15.5 in ]00 OF -30 OF 46 OF ]55 days 5500.7000.0 It Climatic Conditions Annual precipitation... . . . . . . . . . . . . . . . . . . Temperature: Maximum ........................... ... Minimum .............................. Mean .........,........................ Growing season .......................... Elevation of irrigable area. . . . . . . . . . . &NGINEERING DATA Water Supply PLATEAU CREEK Drainage area near Collbran, Colo. ..... Annual discharge: Maximwn 11922) ................... Minimwn 09341................... Average............................... . BIG CREEK Drainage area at Upper Station near Collbran, Colo. . ..... ............. .......,..... Annual discharge: Maximum (1952) ......................., Minimum (951)......................... Average..,........................... . Ccnro:-JWOOD CREEK. Drainage area at Upper Station near Collbrao, Colo. ......... ....................... Annual discharge: Maximum (1929) ........................ Minimum (934)......................... Average............................... . Storage Facilities VEGA DAM Type: Zoned, rolled earth and rockfill Location: On Plateau Creek, about 10 mi east of Collbran, Colo. Construction period: 1957-59 Reservoir, Vega: Total capacity to El. 7984 . , . . . . . . . , . . . . . . . Active capacity...... ........ ........,... Surface area, El. 7984.................... Dimensions: Structural height. . . . . . . . . . . . . . . . . . . . , . . . . Top width. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Maximum base width (approx.) . . . . . . . . . . . . Crest length . ............................ Crest elevation......... ..... ............ Volume.............................. .. Spillway: Uncontrolled ogee crest, concrete lined chute and stilling basin on the right abutment. Outlet works: Concrete pressure conduit from the intake structure to the gate ~mergency chamber, then ~n 8-ft horseshoe conduit, containing a 51-in steel pipe through the dam, where the discharge to Southgate Canal is controlled by two 2.5.ft-square, high-pressure gates. BONHAM DAM Type: Earthfill Location: On Big Creek, about 12 mi south of Collbran. Colo. Construction period: Rehabilitation 1962 Reservoir, Bonham: Total capacity to E1. 9796................ Active capacity..................... Surface area, EI. 9796............ 88 mi2 1]8.500 acre.ft 21,300 acre-ft 68,400 acre.ft 20 mP 27,000 acre-ft 13,700 acre-ft 20,200 acre-ft 20 mi2 20,900 ~cre-ft 6,800 acre--ft 13,200 acre-ft 33,800 ,acre-ft 32,980 acre-ft 897.5 acres 162 It 30 It 880 It 2,100 It 7997.0 It 981,825 yd3 1.124 acre-ft 1.000 acre.ft 88 acres