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Last modified
1/26/2010 12:28:16 PM
Creation date
10/11/2006 9:59:50 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8441.100
Description
Colorado Big Thompson Project - Project Description
State
CO
Basin
South Platte
Water Division
1
Date
12/1/1982
Title
Colorado - Big Thompson Project
Water Supply Pro - Doc Type
Project Overview
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<br />o <br />C) <br />~~ <br />~.... \ <br />c.n <br />~ <br /> <br />Crest elevation .......................... <br />Total volume. . . . . . . . . . . . . . . . . . . . . . . . . . . . <br />Spillway: None <br />Outlet works: None <br />Foundation: Sandstone and shale <br />Special treatment: Cutoff trench and con- <br />crete cutoff wall. <br /> <br />Diversion Facilities <br /> <br />WILWW CREEK FOREBAY DAM <br /> <br />Type: Earth and rockfill <br />Location: On Willow Creek Feeder Canal, <br />1 mi west of Granby Reservoir. <br />Year completed: 1953 <br />Dimensions: <br />Structural height. . . . . . . . . . . . . . . . . . . . . . . . . <br />Hydraulic height. . . . . . . . . . . . . . . . . . . . . . . . . <br /> <br />Crest length. . . . . . . . . . . . . . . . . . . . . . . . . . . . . <br />Crest elevation .......................... <br />Total volume. . . . . . . . . . . . . . . . . . . . . . . . . . . . <br />Spillway: <br /> <br />Capacity ............................... <br />Diversion outlet: Forebay connects to pump- <br />ing plants through 1,500.ft-long channel. <br /> <br />Capacity ............................... <br /> <br />EAST PORTAL DAM <br /> <br />Type: Rockfill with concrete corewall <br />Location: On the Wind River at East Portal <br />of Alva B. Adams Tunnel, 4.5 mi <br />southwest of Estes Park, Colo. <br />Year completed: 1947 <br />Dimensions: <br />Structural height.. . . .. . . . . . . . . . . . . .. . . . . . <br />Hydraulic height. . . . . . . . . . . . . . . . . . . . . . . . . <br /> <br />Crest length. . . . . . . . . . . . . . . . . . . . . . . . . . . . . <br />Crest elevation .... . . . . . . . . . . . . . . . . . . . . . . <br />Spillway: <br /> <br />Capacity ............................... <br />Crest elevation .......................... <br />Diversion outlet: To Parshall flume section <br />ahead of Aspen Creek Siphon. <br /> <br />Capacity ............................... <br /> <br />LITILE HELL CREEK DIVERSION DAM <br /> <br />Type: Earth and rockfill <br />Location: On Little Hell Creek above Pole <br />Hill switchyard. <br />Year completed: 1952 <br />Dimensions: <br />Structural height. . . . . . . . . . . . . . . . . . . . . . . . . <br />Hydraulic height. . . . . . . . . . . . . . . . . . . . . . . . . <br /> <br />Crest length. . . . . . . . . . . . . . . . . . . . . . . . . . . . . <br />Crest elevation .......................... <br /> <br />Volume ................................ <br />Spillway: None <br />Diversion capacity . . . . . . . . . . . . . . . . . . . . . . . <br /> <br />SOUTH PLATIE SUPPLY CANAL DIVERSION DAM <br /> <br />Type: Diversion embankment and concrete <br />overflow structure connected by 885-ft <br />channel <br />Location: On Boulder Creek about 8 mi <br />east of Boulder, Colo. <br />Year completed: 1956 <br />Dimensions: <br />Structural height (embankment) ..... . ... .. . <br />Hydraulic height (embankment) . . . . . . . . . . . . <br />Crest length (embankment) . . . . . . . . . . . . . . . . <br />Crest length (concrete section) . . . . . . . . . . . . . . <br /> <br />Colorado-Big Thompson Project <br /> <br />5440.0 ft . <br />2,095,240, yd' <br /> <br />Crest elevation (embankment) .. . . . . . . . . . . . <br />Spillway: Concrete overflow type <br /> <br />Capacity ............................... <br /> <br />POLE HILL AFTERBAY DAM <br /> <br />Type: Earth and rockfill <br />Location: Below Pole Hill Powerplant, 10.5 <br />mi east of Estes Park, Colo. <br />Year completed: 1953 <br />Dimensions: <br />Structural height. . . . . . . . . . . . . . . . . . . . . . . . . <br />Hydraulic height. . . . . . . . . . . . . . . . . . . . . . . . . <br /> <br />Crest length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <br />Crest elevation .......................... <br />Volume ................................. <br />Siphon spillway: <br /> <br />Capacity ............................... <br />Crest elevation .......................... <br />Diversion capacity . . . . . . . . . . . . . . . . . . . . . . . <br /> <br />24 ft <br />II ft <br />580 ft <br />8120.0 ft <br />15,000 yd' <br /> <br />BIG THOMPSON DIVERSION DAM <br /> <br />Type: Concrete box, combined overflow and <br />grated inlet <br />Location: On the Big Thompson River, at <br />west portal of Horsetooth Supply Conduit, <br />8.5 mi west of Loveland, Colo. <br />Year completed: 1950 <br />Dimensions: <br />Structural height. . . . . . . . . . . . . . . . . . . . . . . . . <br />Hydraulic height. . . . . . . . . . . . . . . . . . . . . . . . . <br /> <br />Crest length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <br />Crest elevation .......................... <br />Weir crest length.. .. ... . .. .. .. .. . . . .. .... <br />Weir crest elevation . .. . .. . .. .. .. . .. . . .. . . <br /> <br />Volume ................................ <br />S~iIIw~y: Overfl?w <br />D,verSIOn capacIty . . . . . . . . . . . . . . . . . . . . . . . <br /> <br />450 ft'/s <br /> <br />400 ft'/s <br /> <br />76 ft <br />10 ft <br />245 ft <br />8265.0 ft <br /> <br />NORTH POUDRE DIVERSION DAM <br /> <br />550 ft'/s <br />8258.3 ft <br /> <br />Type: Concrete ogee weir <br />Location: On the Cache la Poudre River <br />about 11 mi northwest of Fort Collins, <br />Colo. <br />Year completed: 1952 <br />Dimensions: <br />Structural height. . . . . . . . . . . . . . . . . . . . . . . . . <br />Hydraulic height. . . ..... .. .... ... ., ., . .. . <br /> <br />Crest length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <br />Crest elevation .......................... <br />Weir crest length... ..... . .. .. .. .. ., . " .. . <br />Weir crest elevation . . . . . . . . . . . . . . . . . . . . . . <br /> <br />V cilume ................................ <br />Spillway: Overflow <br />Diversion capacity . . . . . . . . . . . . . . . . . . . . . . . <br /> <br />550 ft'/s <br /> <br />43 ft <br />33 ft <br />220 ft <br />6640.0 ft <br />10,000 yd' <br /> <br />Carriage Facilities <br />ELLIOT CREEK FEEDER CANAL <br /> <br />550 ft'/s <br /> <br />Location: From Elliot Creek into Green <br />Mountain Reservoir, just above dam. <br />Construction period: 1943 <br /> <br />Length ............ . . . . . . . . . . . . . . . . . . . . . <br />Capacity ............................. .'. <br />Typical maximum section in earth: <br /> <br />Bottom width . . . . . . . . . . . . . . . . . . . . . . . . . . . <br />Side slopes: <br /> <br />In fill ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <br />In cut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <br />Water depth.. ..... . ... . . .. .. . .. .. .... ... <br />Typical flume section: <br /> <br />Bottom width . . . . . . . . . . . . . . . . . . . . . . . . . . . <br />Water depth ............................ <br />Lining thickness . . . . . . . . . . . . . . . . . . . . . . . . . <br /> <br />10.6 ft <br />5 ft <br />64ft <br />34 ft <br /> <br />15 <br /> <br />5052.2 ft <br /> <br />230 ft'/s <br /> <br />32 ft <br />21 ft <br />220 ft <br />6597.0 ft <br />6,000 yd' <br /> <br />550 ft'/s <br />6593.0 ft <br />550 ft'/s <br /> <br />35 ft <br />8 ft <br />90 ft <br />5500.0 ft <br />50 ft <br />5486.5 ft <br />1,300 yd' <br /> <br />600 ft'/s <br /> <br />24 ft <br />6 ft <br />200 ft <br />5439.0 ft <br />130 ft <br />5428.0 ft <br />1,300 yd' <br /> <br />250 ft'/s <br /> <br />1.1 mi <br />90 ft3/s <br /> <br />4ft <br /> <br />1.5:1 <br />2:1 <br />2 ft <br /> <br />9.5 ft <br />2 ft <br />6 in <br />
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