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<br /> <br />East Portal - A1.va B. Adams Tunnel.. <br /> <br />When the tvo headings mat under the Continental Divide, the <br />difference in alignment !illd grade cl.oBll:re could be coverea. by a 25- <br />cent piece. Temperatures in the. tunnel. varIed vith the a.epth of <br />ground. cover--max:!lllum approx1Inatel.y 4,000 feet--!illd. ranged fram <br />46.40 F. near the portals to a high of 76.60 F. six m1l.esin fram <br />the east portal. Constructed on a sl.ope of .00l.55 for a difference <br />of 107.feet in el.evation betveen portals, the tUnnel. is. .concrete- <br />lined throughout !illd has a capacity of approx:lmate1.y 355 million <br />gallons per day. Construction requirea. 308,563 cubic. yards of <br />excavation, 4,280,728 pounds of steel., and 1.24,41.1 cubic yards of <br />concrete. Tunnel. fl.ovs are regulated by tvo 9-foot by l.O-foot <br />radial gates operated from the gatehouse at the vest portal or by <br />remote control froiJJ. the Granby Pumping Pl.ant. <br /> <br />Excavation fram the east portal required 37~ months, an average <br />of l.,146 feet being driven each month. The vest portal contractor <br />vorked 31 months and averaged 833 feet per month. A max:!lllum of 74 <br />feet vas driven in one 24-hour period. <br /> <br />A small reservoir at the east portal serves as a stilling pool. <br />to regulate tunnel discharges prior to their release into the Estes <br />Park Aqueduct and Pover System at the .Aspen Creek Siphon. <br /> <br />A pipe-enclosed electrical conduit suspended from the tunnel <br />roof above the normal. water surface connects Eastern and Western <br />Sl.ope transmission circuits of the project. This conduit consists <br /> <br />1.6 <br />