High Mountain Dams in Upalco Unit, Five Point Lake Dam, Ashley National Forest, 12 miles Northwest of Swift Creek Campground, Mountain Home

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Five Point Lake is the largest reservoired body of water in the Yellowstone drainage, and with a crest length of 970 feet, Five Point Lake Dam is the second longest of the earthen dams in the Upalco Unit. A representative earth-fill structure with stone riprap facing, the dam is additionally notable because of the original construction equipment left on-site. Essentially unaltered and well-preserved, the Five Point Lake Dam, with its natural stone spillway, is one of the most picturesque in the unit. Inventoried by: Clayton Frascr and James Juralc Fraserdesign Loveland, Colorado October 19, High Mountain Dams in Upalco Unit, * Kidney Lake Dam HAER No. UT-42-H (Page 2)

Historical Information

On February special use permits were issued by the National Forest Service to the Farmers Irrigation Company for the purpose of water storage on Five Point and Superior lakes, to high mountain lakes in the Yellowstone River drainage. On Five Point Lake, the coompany built two dams, a long V-shaped primary structure with a steel pipe outlet and a much smaller secondary dike in The dams are earth fill, with sloped and riprappcd upstream and downstream faces. The spillway is a natural rock saddle 300 feet south of the main outlet, with a concrete crest poured to minimize erosion. With a surface area of over 82 acres, Five Point is the largest reservoir in the Yellowstone drainage.

With an aggregate crest lend of almost feet, the two dams in the lake's southeast corner constitute the longest retention structure in the basin. It is proposed to excavate a spillway through the dam and block the existing outlet to lower the water to within two feet of its naturaL level.

Architectural Information

Dam length: 970 feet Dam height: 14 feet Dam width: 10 feet Construct: Earth fill dam with stone riprap facing Lake size: acres; 607 acre-foot maximum capacity; 11 vertical foot maximum drawdown Outlet: Gated steel pipe BIOGRAPHICAL INFORMATION "Preliminary Engineering Report: Stabilization of High Mountain Lakes, Upalco Unit," National Forest Service Report, page 34. William F. Gettleman, "Report on the Lakes and Reservoir of the Headwaters of the Uintah, Whiterocks and Lakefork Rivers, Uintah Project, Utah; Feb. page. 23. Five Point Lake Reservoir File Roosevelt District Ranger Office, Ashley National Forest, Field inspection by Robert Righter, July For additional information, see Irrigation Canals in the Uinta Basin, HAER No. UT-30.

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