Overview
Pinto Dam is located just north of Highway 28 in the eastern portion of Grant County. Pinto Dam forms Billy Clapp Lake, an off-stream reservoir which stores water for the Columbia Basin Irrigation Project. The nearest towns are Stratford and Wilson Creek. Just north of the dam is a boat launch and sandy beach area that allows access to Billy Clapp Lake. The Main Canal begins at the headworks at Dry Falls Dam and consists of unlined and concrete-lined sections. Total length of the canal, including siphons, tunnels, and Billy Clapp Lake is 18.4 miles. The first 1.8 miles from Dry Falls Dam to the Bacon Siphon and Tunnel structures has been increased in capacity from 13,200 to 19,300 cubic feet per second. Bacon Siphon and Tunnel structures consist of two siphons, each about 1,000 feet long, and two tunnels, each about 2 miles long, that carry the water to Billy Clapp Lake.
General
| Project | Columbia Basin |
| Dam Type | Zoned Earthfill |
| Longitude | -119.2533 |
| Latitude | 47.4483 |
| Watercourse | Offstream Storage |
| Reservoir | Billy Clapp Lake |
| Original Construction | 1946-1948 |
| National ID Number | WA00269 |
Dimensions
| Crest Elevation | 1351.0 ft |
| Structural Height | 130.0 ft |
| Hydraulic Height (Normal Operating Depth at Dam) | 101.0 ft |
| Crest Length | 1900.0 ft |
| Top of Active Conservation Pool (Elevation) | 1335.0 ft |
| Spillway Crest Elevation | 1346.8 ft |
| Streambed at Dam Axis | 1335.0 ft |
| Top of Inactive Conservation Pool (Elevation) | 1312.76 ft |
| Top of Dead Storage Pool (Elevation) | 1244.00 ft |
Hydraulics & Hydrology
| Spillway Type | Ungated |
| Spillway Capacity at Elevation | 9,300 cfs at 1346.8 ft |
| Total Water Storage at Elevation | 21,200 ac-ft |
| Outlet Works Capacity at Elevation | 1,000 cfs at 1343.6 ft |
| Hydrometeorological Report (HMR) | HMR 57 |
| Normal Water Surface Elevation | 1335.0 ft |
| Auxiliary Spillway | No |
| Diversion Capacity at Elevation | 9,700 cfs |
| Drainage Area | 190.0 sq mi |
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