Overview
Agency Valley Dam is located on the North Fork of the Malheur River near Beulah, Oregon, The dam is a 110-foot-high zoned earthfill structure that contains 646,000 cubic yards of material. The total capacity of the reservoir is 59,200 acre-feet (active 59,200 acre-feet). The needle valves in the outlet works were replaced by jet flow gates in 1990 as part of the operation and maintenance modifications program.
Geology
The foundation consists of Columbia River Basalts with interbeds of basaltic tuff, tuff-breccia, and volcanic ash overlying shale in the right abutment. Shales form the left abutment and channel section foundation.
General
| Project | Vale |
| Location | 15 miles north of Juntura, Oregon |
| Longitude | -118.154354 |
| Watercourse | North Fork of the Malheur River |
| Reservoir | Beulah |
| Original Construction | 1934-1935 |
| National ID Number | OR00589 |
| Dam Type | Zoned Earthfill |
| Latitude | 43.9117446 |
Dimensions
| Crest Elevation | 3348.00 ft |
| Hydraulic Height (Normal Operating Depth at Dam) | 80.0 ft |
| Crest Length | 1850.0 ft |
| Top of Joint Use Pool (Elevation) | 3340.0 ft |
| Top of Active Conservation Pool (Elevation) | 3340.0 ft |
| Top of Dead Storage Pool (Elevation) | 3263.2 ft |
| Streambed at Dam Axis | 3260.0 ft |
| Structural Height | 110.0 ft |
| Spillway Crest Elevation | 3323.0 ft |
Hydraulics & Hydrology
| Normal Water Surface Elevation | 3340.0 ft |
| Spillway Type | Concrete-lined chute located on the right abutment, controlled by three 18-foot-wide by 17-foot-high radial gates. |
| Auxiliary Spillway | No |
| Total Water Storage at Elevation | 59,212 ac-ft at 3340 ft |
| Outlet Works Capacity at Elevation | 600 cfs at 3340.0 ft |
| Drainage Area | 444.0 sq mi |
| Hydrometeorological Report (HMR) | HMR 57 |
| Spillway Capacity at Elevation | 10,300 cfs at 3343.0 ft |
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