High Mountain Dams in Upalco Unit, East Timothy Lake Dam, Ashley National Forest, 8.4 miles North of Swift Creek Campground, Mountain Home

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With a crest length of almost feet, the East Timothy Lake dam is distinguished as by far the largest dam in the Upalco Unit of the Central Utah Project. It was completed in as the last privately financed dam in the Swift Creek drainage, a substantial capital investment for the Moon Lake Water Users Association. The construction of the dam resembles that of other dams built in the and indicating the relatively unsophisticated nature of earth-fill technology. Inventoried by: Clayton Fraser and James Jurale Fraserdesign Loveland, Colorado October 19, High Mountain Dams in Upalco Unit, East Timothy Dam HAER No. UT-42-F (Page 2)

Historical Information

The highest feet and most northerly situated lake on the Swift Creek drainage is East Timothy Lake. The lake is fed from an extensive drainage field involving five other lakes and acres of land. Brigham Timothy was the first to file and receive an approved application from the State Engineer to impound irrigation water in the 40-acre lake sometime around He was awarded a Forst Service special use permit soon after and constructed a 12-foot by 18-foot sod dam across the outlet.

Timothy's water rights to the lake were transferred to the Swift Creek reservoir Company, which in turn became part of the Moon Lake Water Users Association, In the irrigation company removed Timothy's rudimentary sod dam and built an extensive earth-fill structure, feet long and 34 feet high, by scooping material from the lake basin. Today, the dam is subject to widespread seepage on the downstream toe, and the lake is maintained at maximum drawdown to avoid structural failure. It is proposed that the dam be stabilized and breached, with an outlet installed to lower the water to near its natural level.

Architectural Information

Dam length: feet Dam height: 34 feet Dam width: 15 feet Construct: Earth fill dam with stone riprap facing Lake size: acres; 569 acre-foot maximum capacity; 19 vertical foot maximum drawdown Outlet: Gated steel pipe BIOGRAPHICAL INFORMATION "Preliminary Engineering Report: Stabilization of High Mountain Lakes, Upalco Unit, National Forest Service Report, William F. Gettleman, "Report on the Lakes and Reservoir of the Headwaters of the Uintah, Whiterocks and Lakefork Rivers, Uintah Project, Utah; February page 25. East Timothy Lake Reservoir File Roosevelt District Ranger Office, Ashley National Forest, Roosevelt, Utah Field inspection by Clayton Fraser and Robert Righter, July 25, For additional information, see Irrigation Canals in the Uinla Basin, HAER No. UT-30.

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