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I'.l I I' i o C:) ~... t. ",., CJ\ ~ 12 ENGINEERING DATA Water Supply COLORADO RIVER Drainage area above Shadow Mountain Dam . Annual discharge at Shadow Mountain Lake: Maximum (1978) ........................ Minimum (l934} . . . . . . . . . . . . . . . . . . . . . . . . . Average ................................ Drainage area between Granby Dam and Shadow Mountain Dam. . . . . . . . . . . . . . . . . Annual discharge at Lake Granby: Maximum (l957) ........................ Minimum (1954)......................... Average... ... .. . . . . .., ... . .. .. .. .. .. . . . WILLOW CREEK Drainage area above Willow Creek Dam. . . . . Annual discharge at Willow Creek Reservoir: Maximum (1962) .. . .... .. .. .. .. . ., . ... .. Minimum'(I981) ........................ Average ................................ Estimated average annual diversions (all sources) .............................. BLUE RIVER Drainage area above' Green Mountain Dam.. Annual discharge at Green Mountain Reser- voir: Maximum 0957) . .. .. . . . .. .. .. .. . .. . .. . . Minimum 09641 . . . . . . . . . . . . . . . . . . . . . . . . . Average ................................ Storage F acilitics GREEN MOUNTAIN DAM Type: Zoned earthfill Location: On the Blue River, 13 mi south- east of Kremmling, Colo. Construction period: 1938-43 Date of closure (first storage): November 16, 1942 Reservoir, Green Mountain: Average annual inflow, 1937-76............ Total capacity to EI. 7950 ................ Active capacity, EI. 7870-7950 ............. Surface area. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dimensions: Structural height. . . . . . . . . . . . . . . . . . . . . . . . . Hydraulic height. . . . . . . . . . . . . . . . . . . . . . . . . Top width ....... . . . . . . . . . . . . . . . . . . . . . . . Maximum base width. . . . . . . . . . . . . . . . . . . . . Crest length. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Crest elevation .......................... Total volume. . . . . . . . . . . . . . . . . . . . . . . . . . . . Spillway: Concrete-lined open channel in left abutment controlled by three 25- by 22-it radial gates. Elevation top of gates. . . . . . . . . . . . . . . . . . . . . Crest elevation ....................... . . . Capacity at EI. 7950 . .. .. . . .. .. . .. . . . .. . .. Outlet works: Concrete-lined tunnel through right abutment enclosing two 8.5-ft- diameter steel penstocks leading to powerhouse. An outlet pipe branches from each penstock near the downstream end. Each outlet is controlled by a 44-inch needle valve. Capacity at EI. 7950 . . . . . . . . . . . . . . . . . . . . . . Colorado-Big Thompson Project 187 mi' 310,000 acn:..ft 63,000 acre-ft 139,800 acre-ft 124 mP 369,400 acre- ft 132,000 acre-ft 230,300 acre-ft 127 mP 102,000 acre-it 23,600 acre-ft 55,000 acre-ft 257,700 acre-ft 599 mi' 517,900 acre-ft 171,900 acre-it 345,100 acre-ft 345,100 acre-ft 153,639 acre-ft 112,849 acre-ft 2,130 acres 309 ft 264 it 40 ft 1,688 ft 1,150 it 7960.0 ft 4,360,211 yd' 7950.0 it 7928.0 ft 25,000 ft'/s 1,530 W/s Foundation: Thin-bedded limey shale over- lying moderately hard and firm trachyte porphyry sill. Joints, slips, and faults are combined with a high water table on both abutments. Special treatment: Cement grout curtain beneath five cutoff walls, supplemental grouting of abutments; exposed shale painted with asphalt emulsion. GRANBY DAM AND DIKES Type: Zoned earthfill Location: On the Colorado River, 8 mi northeast of Granby, Colo. Dikes No. 1,2, and 4 are continuous and close low areas west of Granby Dam. No.3 closes a saddle about 1 mi southeast of Granby Dam. Construction period: 1941-50 Date of closure (first storage): September 14, 1949 Reservoir, Lake Granby: Average annual inflow, 1937-76. .... . . . " .. Total capacity to El. 8280 . . . . . . . . . . . . . . . . . Active capacity, El. 8186.9-8280. ... . ... .. .. Surface area. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dimensions: Dam Structural height. . . . . . . . . 298 ft Hydraulic height. . .. .. .. . 231 it Top width .. .. . . . . .. . .. . 40 ft Maximum base width..... 1,515 ft Crest length. . . . . . . . . . . . . 861 It Total volume. . . . . . . . . . . . 2,974,000 yd' Spillway: Concrete-lined open channel at leit abutment controlled by two 21- by 20-ft radial gates. Elevation top of gates. . . . . . . . . . . . . . . . . . . . . Crest elevation .......................... Capacity at El. 8280 . . . . . . . . . . . . . . . . . . . . . . Outlet works: Concrete-lined tunnel through left abutment controlled by one 120in needle valve and one 30-in hollow-jet valve. Capacity at EI. 8280 . . . . . . . . . . . . . . . . . . . . . . Foundation: Granite, schist, and gneiss bed- rock with many minor faults. Special treatment: Cutoff trench and two concrete cutoff walls. WILLOW CREEK DAM Type: Zoned earthfill Location: On Willow Creek, 4 mi north of Granby, Colo. Construction period: 1951.53 Date of closure (first storage): April 2, 1953 Reservoir, Willow Creek: Average annual inflow, 1937-76............ Total capacity to EI. 8130 . . . . . . . . . . . . . . . . . Active capacity, EI. 8077-8130 ............. Surface area. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dimensions: Structural height. . . . . . . . . . . . . . . . . . . . . . . . . Hydraulic height. . . . . . . . . . . . . . . . . . . . . . . . . Top width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Maximum base width. . . . . . . . . . . . . . . . . . . . . Crest length. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Crest elevation .... . . . . . . . . . . . . . . . . . . . . . . Total volume. . . . . . . . . . . . . . . . . . . . . . . . . . . . Spillway: Uncontrolled concrete-lined overflow weir and chute at left abutment. Crest length. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Crest elevation .......................... Capacity at EI. 8132 . . . . . . . . . . . . . . . . . . . . . . 230,300 acre-ft 539,800 acre-ft 465,568 acre-ft 7,260 acres Dikes No.1, 2, and 4 20-98 {t Offstream 30 It 120-400 it 4,430 It 995,000 yd' Dike No.3 60ft Offstream 30 it 649ft 8,292 It 744,000 yd' 8280.0 ft 8260.0 ft 11,500 ft'/s 435 ft'/s 55,000 acre-it 10,600 acre-ft 9,100 acre-ft 303 acres 127 ft 95 ft 30 ft 715 ft 1,100 ft 8140.0 It 392,000 yd' 335.3 ft 8130.0 ft 3,200 ft'/s