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<br />76
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<br />Studies and Reports
<br />(a) Report an.d preliminary cost estimate, of Grand
<br />Lake-Big Thompson Transmountain project, February
<br />8 1936, (b) SUlrimary report on proposed Oolorado_
<br />Big Thompson project, approved for Publicaticn Febru_
<br />ary 16, 1937. (0) Synopsis of sUllUnary report, pre-
<br />sented by Senator Alva B. Adallls and printed as Senate
<br />Document No. 80 of the 75th Oongress,
<br />
<br />A.uthorized
<br />(a) Interior Department Appropriation Act of August
<br />9, 1937 (50 Stat, 595), (b) Finding of feasibility
<br />approved by the President on December 21, 1937/ in.
<br />aCOordance with the plan contained in Senate Document
<br />No. 80, "75th Oongress} 1st Session.
<br />
<br />Jilinding oj FeasiOility
<br />Report made to the Seeretary of the Interior, April
<br />24, 1937,
<br />Oonstructwn BefJUn
<br />(a) Green Mountain Dam, November 30, 1938..
<br />(b) A,lva B, Adams Tunnel, June 23,1940, (c) Shadow
<br />Mountain Dam, January 3, 1944, (d) Gxanby Dam,
<br />' June 17, 1946, (e) Horsetooth ReserVOir; Spring
<br />, Oanyon Dam, July 17, 1946, Horsetooth Dam, August
<br />'9 1946 Soldier Canyon Dam and Dixon Canyon Dam,
<br />A~gu8t"20, 1946, (f) Marys Lake Dikes, April 7,
<br />1947:'\g) Olympus Dam, August 20,1947,
<br />
<br />Wirst Water Available
<br />Through Alva B, Adams Tunnel, June 23, 1947,
<br />
<br />first POwer Transmitted
<br />Green Mountain Power plant, May 18, 1943.
<br />
<br />Operating Agency
<br />. Bureau of Reclamation.
<br />
<br />SCHEME OF DEVELOPMENT
<br />PLAN AND PURPOSE
<br />The primary purpose of the Colorado_Big Thompson
<br />pr6ject is to divert surplus Water from the Oolorado
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<br />PROJECT DATA
<br />
<br />River on the western slope of the Continental Divide
<br />to supplement the existing SUpply for lands on the
<br />eastern slope. Tbe Secondary purpose is to. generate
<br />hYdroelectric power from the system wherever falli4g
<br />\vater otIers a suitable OpportUnity. An estimated
<br />average quantity of 310,000 acre.feet is available each
<br />year for diversion from a point east of Grand Lake
<br />near the head of th. Oolorado River, yet such diversion,
<br />With the replacement storage proposed, Wiil not en-
<br />croach Upo.n the present Of future irrigation require_
<br />ment of western slope lands in Colorado.. This de-
<br />pendable supplemental supply will improve economic
<br />stability through reduction iu drought hazards, more
<br />abundant crops, and increased income.
<br />The project plan includea the folloWing features
<br />Wmeh function together as a unit:
<br />Iff"n Mountain Dam and Reservoir on the .Blue
<br />Rivor, a western slope tribntary, stores water to pro-
<br />tect Colorado River Basin USers against depletidn of
<br />their late sunnner snpply resulting from diversion to
<br />the eastern slope, and assiats further we'tern slope
<br />development.
<br />Iffanby Dam, and Reservoir on the Colorado River,
<br />stores the flow o.f the Colorado. River as well as water
<br />diverted from Wiliow Creek, a tributary of the 0010-
<br />rado, and Walden Hollow, StrawbeITy and Meadow
<br />Creeks, tributaries of the Fraser River.
<br />Iffanay Pumping Plant and Iffanay Pump Oarwl
<br />conveys water from Granhy Reservoir to Shadow
<br />Mountain Reservoir.
<br />Shadow Mountain Dam and Lake on the North Fork
<br />of the Ooiorado River, maintained at the level of
<br />Grand Lake, receives water pumped from the Granby
<br />Reservoir which Grand Lake diSCharges into the Alva
<br />B. Adams Tunnel.
<br />A.lva B, Adam8 Tun1U31 receives water from Grand
<br />Lake on the western slOPe and calTies it nnder the
<br />Continental Divide to an eastern slope, point on the
<br />Wind RiVer D:ve miles southwest of Estes Park.
<br />Estes Park A.Q1U3ducl and Power System extends from
<br />the East Portal Dam on the Wind River to Estes POwer
<br />plant near Estes Park. It inclndes the East Portal
<br />D_, Aspen Creek Conduit and SiPhon, Rams Horn
<br />Tunnel, Marys Lake .pOWer plant, Marys Lake Dams
<br />and Reservoir, Prospect Conduit and Prospect Moun_
<br />tain Tunnel, and Estes power plant.
<br />Este8 FootMlk A.queduct and POWer System extends
<br />from Estes pOWer piant to Flatiron Power plant, It
<br />inclUdes Olympus Dam and Estes Reservoir, Olympus
<br />Tunnel Pole Hili Tunnel, Quillan Power plant, Cotton_
<br />Wood Power Plant, Rattlesnake Power plant, Flatiron
<br />Power plant, together with a system of connecting
<br />tunnels, canals and siphons.
<br />Oarter Lake Dams and Reservoir, one of the three
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