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Show NPS Form 10-900a (Rev. 8-86) Utah Word Processor Format (02741) Approved 10/87 OMB No. 1024-0018 United states Department of the Interior National Park Service NATIONAL REGISTER OF HISTORIC PLACES CONTINUATION SHEET Section number 7 Page ____7 _____ Stairs Station Hydroelectric Power Plant Historic District, Salt Lake City, Salt Lake County, Utah feeling, association, design, materials, and workmanship. Storm Dam is a contributing feature in the Stairs Station Historic District. Mount~in 4. Conduit Water entering the Storm Mounta in Dam intake i s first carried west through a welded steel pipe about 1,200 ft. long. Roughly the western half of the steel pipeline lies in a tunnel that was bored through a rock formation that extends from the north side of Big Cottonwood Canyon. Both ends of this tunnel have been closed with concrete, so the interior of the tunnel is not visible. Between the dam and the tunnel, the pipeline lies underground e xcept for a short section just before it enters the tunnel. However, the course of the pipeline is apparent because earth was me r el y deposited o ver the p i peline so that it. now appears as 2 long, low mound lying between the dam and the tunnel. After e ~ i t ing tIle west end of the tunnel, the pipeline is now visible because Utah Power and Light has recently replaced a section of it between the tunnel and the top of the penstock. The original conduit, erected in the mid-1890s, was probably either replaced or reno va ted i n 1921, at the time Storm Mountain Dam was built. Therefore, the conduit component of Stairs Station best represents the historic associations of a 1921 date. Except for minor alteration, the steel pipellne conduit retains integrity of setting, location, feeling, materials, association, design, and workmanship. The conduit contributes to the historic district. 5. Penstock The penstock is original, and was fabricated by Fraser and Chalmers of Chicago. It consists of a riveted steel pipe approximately 1,750 ft. i n length. At its top, the penstock has a 50 in. diameter and is made of steel 1/4 in. thick. The penstock gradually decreases in diameter and increases in thickness as it descends toward the powerhouse. At the bottom, the penstock has a 49 in. diameter and is made of steel 1/2 in. thick. The penstoc k is above ground except for about the last 150 ft., which now lies |
