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<br />tunnel. he normal elevation of Grand and Shadow Mount!!.in Lakes would be 8.369
<br />feet, .
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<br />The present maximum fluctuation of Grand Lake is about, 4 feet, or flran an
<br />elevatio, of 8,:;68 in winter to 8,:;72 feet during the peak run-off from,meltj,ng
<br />snow. T e automatic control gates at the North Fork Diversion Dam and li:t
<br />tunnel 'i let will so control' the elevation ot the water sl,lrface in Gram Lake
<br />that it ould never fluctuate more than 1 foot.
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<br />The Oontinental Divide tunnel extends from the easterly end of GrandLllke
<br />to Wind her, southwest of Estes l'lI.rk, with an azimuth of 242- 2()' 30", aItd
<br />l,ngth 0 69.023 feet. It is to be horseshoe shape 9.5 !'eet' in diameter and
<br />lined t oughout with a 9-inchconcrete lining.
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<br />It ill be located entirely in pre-Oambrian rock consisting of the Longs
<br />Peak and related granites and the gneisses and schists of the Ids.llo Spr~ngs
<br />formatio. The granites are strong massi'Ve rocks. Gneisses predomillllotil' over
<br />schists nd only a small proportio%). have praninent and,continuouscleaV$ge
<br />planes. The proportion of granite t'o gneiss and schist is approximately 4 tolo
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<br />Fro a detailed geological survey of the tunnel and, comparing it with con-
<br />ditione ctuallyencountered in the Moffat Railroad tunnel, whioh was built
<br />under th Oontinental Divide for the Denver & Salt Lake Railroad, and ahout25
<br />miles du south of this one. it was estimated there woUl.dbe only 400 fe~t cf
<br />bad gro and 5,200 feet of grcund needing support. However, fot purpo'ses of
<br />estimat, it was figured there would be 6,900 feet of bad ground and 17,500
<br />feet of round needing support. The tota.l $stim/l.ted cost is Ali7,271,37l.:
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<br />POWER OONDUIT NO. 1
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<br />Pow r conduit no. 1 extends fran the east portl\l of the Continental Divide
<br />tunnel i Wind River to the penstock of power plant no. 1 on the IlOrthe~t slope
<br />of Pros t Mountain.
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<br />ends of the Continental Divide tunnel arewithol,lt the nationa~_patk
<br />but the area east of the east port!!.l is authorized by, Oongres,s,to be
<br />through that area. The water will be taken through a closed obnduit
<br />of a lO-foot reinforced conorete pipe completely buried. The total
<br />power conduit is 5.:;6miles, of which 1.86 miles is clos,ed cOl'!duit;
<br />is cOnQrete lined tunnel. 0.98 mile is Siphon, and the remail1(\er is
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<br />Bot
<br />boundari
<br />taken in
<br />cons isti
<br />length 0
<br />1.19 mile
<br />open cana .
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<br />estimated cost of power conduit no. 1 is, $1,101,000.
<br />
<br />POWER PI,ANT NO. 1
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<br />Powe plant no. 1 will be located on t,he south bank of the Big Thanl?s~
<br />River abo t one-half mile east of ,Estes Park.. It will contain two 15,000
<br />kilovolt- pere generati1'ig units with auxiliaries. Each unit will oonsi,.t of
<br />a vertica -shaft, single-runner, spiral.-cas-ing type hydraulic turbine optrati:ng
<br />under an ftective head of' 705 feet direot oOnnected to a 15,000 kilovolt-ampere
<br />water-whe 1 type generator. A cOmplete, description with cost e,stimate will 'be
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