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U.S. JUREAU OF RECLAMATION.
Wilbur A. Dexheimer, Commissioner
5^8 PLATORO DAM
. ^ ,)::.. ji.1 San Luis Valley Project ;>
Purpose: Storage for irrigation and flood control
Location: On the Conejos River 1 mile west of Platoro, Colo.
Water supply: Conejos River ,
Drainage area: 39. 7 square'miles'
Maximum flood: 1,380 cubic feet per second (1949)
Area: 950 acres
Total storage (including superstorage): 67,800 acre-feet at elevation 10,042.0
Irrigation and flood control storage: 60,000 acre-feet at elevation 10,034.0
Dead storage: None
Type: Two rolled-earth and rockfill a^uctures (a main section and a dike section,
separated by a rock knoll) .
Height: 145 feet above streambed, 165 feet above excavation
Slopes: Upstream, 2.*l/2/to I to a 20-foot berm at elevation 9965, then 5 to 1 to base
section; depth from 3 to 10 feet. A concrete grout cap was placed
Spillway and Outlet
Type of spillway: Open-cut unlined channel through the rock knoll; no stilling basin
Maximum discharge: Spillway, 3,000 cubic feet per second with reservoir surface
at elevation 10, 041.0
Outlet, 600 cubic feet per second with reservoir surface at elevation 9963. 0 Outlet conduit: Through right abutment of dam. A high-pressure tunnel 6 feet 6 inches in diameter extends to gate chamber near axis of dam, whence a 56-inch-diameter steel pipe extends through 8. 5-foot horseshoe tunnel to valve house.
Control works: One 4- by 5-foot high-pressure emergency gate in gate chamber
Two 48-inch butterfly control valves in valve house at lower ends of bifurcated steel pipe