File:Pacific service magazine (1918) (14783387525).jpg

Identifier: pacificservicema1019paci (find matches)
Title: Pacific service magazine
Year: 1912 (1910s)
Authors: Pacific Gas and Electric Company
Subjects: Pacific Gas and Electric Company Electric utilities Electrical engineering Public utilities
Publisher: San Francisco : Pacific Gas and Electric Company
Contributing Library: San Francisco Public Library
Digitizing Sponsor: San Francisco Public Library

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rator capacity 26,000 horsepower. their area when full is 118.3 acres, witha watershed of 500 acres. The dam is1552 feet long, 22 feet high and 42.5 feetwide at the base, this being sufficient toraise the surface of these lakes 20 feetvertically and to develop a storagecapacity of 1340 acre-feet. The water isdischarged from Twin Lakes into astream which flows down to MeadowLake, thence into the north fork of theMokelumne River. Meadow Lake is an artificial reservoirabout three miles westerly from Twin floods 141.2 acres with the present 73.5-foot dam and has a storage capacity of6110 acre-feet. The other source of water supply,Bear River Reservoir, was formed by thebuilding of a dam across the Bear River,which is a tributary of the North Forkof the Mokelumne River, from the northside in Amador County, abutting againstthe granite walls of the canyon. Thedrainage area is 28 square miles; storagecapacity 6430 acre-feet. Strictly speaking, the canals supplying Pacific Service Magazine 207
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feet. For this distance,therefore, the water fol-lows a natural course,and during the dry sea-son of the year thegreater part of the waterwhich comes down theMokelumne River is thatwhich is allowed to runinto it from the reser-voirs of the Blue LakesSystem. The Amador Canal isforty-two miles inlength, seventeen andone-half miles of whichlies along the steep rockyslopes of the main can-yon of the MokelumneRiver. Seventeen and one-half miles be-low the headgate the canal turns abruptlyto the north, passing through a short tun-nel, called the Madden Tunnel, andemerging upon the other side of a dividewhere it enters a country of a very dif-ferent character. As the canal has asoutherly exposure along the river side,such snow as falls melts quickly and thecanal is never blocked with snow or ice.Eight miles below the headgates the canalpasses around a bare granite cliff, knownas Bald Rock, in a wooden flume one milein length. From the head works to thefoot of Bald Rock the general charactero

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