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a C) ~-' I. ., CJ1 01 Outlet works: Diversion: Willow Creek Feeder Canal headworks at left abutment, controlled by two 8- by 7 -ft radial gates. Capacity (maximuml . . . . . . . . . . . . . . . . . . . . . Outlet: Concrete. lined tunnel through right abutment, controlled by two 3- by 6.5-ft high-pressure slide gates. Capacity at EI. 8132 . . . . . . . . . . . . . . . . . . . . . . Foundation: Fine-grained siltstones with R series of lava flows. Special treatment: Cutoff trench and concrete cutoff wall. SHADOW MOUNTAIN DAM AND DIKES Type: Zoned eanhfill Location: On Colorado River below its con- fluence with the Grand Lake outlet. Series of low dikes extend from right abutment of dam. Construction period: 1944-46 Date of closure (first storage): 1946 Reservoir, Shadow Mountain and Grand Lake: Average annual inflow, 1920-47 ............ Total capacity to EI. 8367 . . . . . . . . . . . . . . . . . Active capacity, EI. 8366-8367' . . . . . . . . . . . . . Surface area. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dimensions: Structural height. . . . . . . . . . . . . . . . . . . . . . . . . Hydraulic height. . . . . . . . . . . . . . . . . . . . . . . . . Top width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ma."imum base width. . . . . . . . . . . . . . . . . . . . . Crest length (including dikes) . . . . . . . . . . . . . . Crest elevation .......................... Total volume {including dikes} . . . . . . . . . . . . . Spillway: Concrete-lined open channel at right abutment, controlled by two 18- by 20-ft radial gates. Elevation top of gates. . . . . . . . . . . . . . . . . . . . . Crest elevation .......................... Capacity at EI. 8367 . . . . . . . . . . . . . . . . . . . . . . Outlet works: Sluicing outlet only below spillway floor, controlled by 2.5-ft.square slide gate at inlet end. Capacity (maximum I . . . . . . . . . . . . . . . . . . . . . MARYS LAKE DIKES Type: Homogeneous earthfill Location: Two dikes on shoreline of Marys Lake 2 mi from Estes Park, Colo. Construction period: 1947-49 Date of closure (first storage): August 1950 Reservoir, Marys Lake: Total capacity to EI. 804.0 . . . . . . . . . . . . . . . . . Active capacity, EI. 8025-8040 . . ... ., . . ., . . Surface area. . . . . ., . . . . . . . . . . . . . . . . . . . . . . Dimensions: Structural height. . . . . . . . . . . . . . . . . . . . . . . . . Hydraulic height. . . . . . . . . . . . . . . . . . . . . . . . . Top width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ma~imum base width.. . .. .. . . .. . . . .. . . . .. Crest length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Crest elevation .......................... Total volume {both dikes} . . . . . . . . . . . . . . . . . Spillway: None Outlet works: Concrete intake structure to Prospect Mountain Conduit through base of Dike No.1, controlled by one 12.5-ft- square fixed-wheel gate. Capacity (controlled by capacity of conduit) .. Colorado-Big Thompson Project 400 ft'/s 2,050 ft'/s 139,800 acre-ft 18,400 acre-ft 1,839 acre-ft 1,852 acres 63 It 37 ft 30 ft 430 ft 3,077 ft 8375.0 ft 167,000 yd' 8367.0 ft 8348.0 ft 10,000 ft3/s 50 ft3/s 900 acre.ft 547 acre-ft 42 acres Dike No. 1 Dike No. 2 29 ft 35 ft 20 ft 25 it 30 ft 30 It 170 ft 185 ft 820 ft 950 It 8050.0 ft 8050.0 It 90,000 yd3 'One-Ioot operating range in accordance with Senate Document No. 80. 1,300 ft3/s OLYMPUS DAM Type: Zoned earthfill, concrete overflow section Location: On the Big Thompson River, 1.5 miles east of Estes Park, Colo. Construction period: 1947-49 Date of closure (first storage): November 1948 Reservoir, Lake Estes: Average annual inflow, 1937-76............ Total capacity to EI. 7475 . . . . . .. . . . . ., . . . . Active capacity, EI. 7450.25-7475 . . . " . .. . . . Surface area. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dimensions: Structural height. . . . . . . . . . . . . . . . . . . . . . . . . Hydraulic height. . . . . . . . . . . . . . . . . . . . . . . . . Top width. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Maximum base width. . . . . . . . . . . . . . . . . . . . . Crest length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Crest elevation .................. . . . . . . . . Total volume. . . . . . . . . . . . . . . . . . . . . . . . . . . . Spillway: Concrete overflow section at south abutment, controlled by five 20- by 17.ft radial gates. Elevation top oI gates. . . . . . . . . . . . . . . . . . . . . Crest elevation .......................... Capacity at EI. 7475 . . . . . . . . . . . . . . . . . . . . . . Outlet works: Outlet: Two 18-in pipes through gravity section, each controlled by a 2.5-ft-square slide gate. Diversion: Intake to Olympus Siphon at right of overflow section controlled by two 6.25- by 8.0-It fixed-wheel gates. Capacity (controlled by capacity of siphon).. . Foundation: Sand, gravel, and cobbles up to 15 ft deep lying over decomposed, frac- tured and broken granite. Special treatment: Grout curtain beneath concrete section. RA1TLESNAKE DAM Type: Zoned earthfill Location: On Rattlesnake Creek, 12 mi east of Estes Park, Colo. Construction period: 1951-52 Date of closure (first storage): January 4, 1954 Reservoir, Pinewood: Total capacity to EI. 6580 . . . . . . . . . . . . . . . . . Active capacity, EI. 6550-6580 . .. . ... . . . " . Surface area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dimensions: Structural height. . . . . . . . . . . . . . . . . . . . . . . . . Hydraulic height. . . . . . . . . . . . . . . . . . . . . . . . . Top width .............................. Maximum base width. . . . . . . . . . . . . . . . . . . . . Crest length. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Crest elevation .......................... Total volume. . . . . . . . . . . . . . . . . . . . . . . . . . . . Spillway: Uncontrolled concrete weir and concrete-lined chute at right abutment. Crest length. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Crest elevation .......................... Capacity at EI. 6589 . . . . . . . . . . . . . . . . . . . . . . Outlet works: River outlet: Cement-lined, cast-iron pipe through base of dam controlled by one 16-in gate valve. Capacity at El. 6589 . . . . . . . . . . . . . . . . . . . . . . Diversion outlet: Intake to Bald Mountain Pressure Tunnel. Foundation: Generally soft, jointed, decom- posed or broken schist lying over gneiss. Special treatment: Grout curtain beneath cutoff wall. 13 90,300 acre-it 3,068 acre-it 2,659 acre.ft 185 acres 70 ft 45 ft 30 ft 288 ft 1,951 ft 7481.0 ft 311,600 yd3 7475.0 ft 7460.0 ft 22,500 ft3/s 550 ft3/s 2,181 acre-ft 1,570 acre-ft 97 acres 130 ft 100 ft 30 ft 615 ft 1,100 ft 6595.0 ft 432,000 yd3 102 ft 6580.0 ft 10,4.00 ft'/s 23 ft3/s