Agency Valley Dam


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.


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.

RegionFacilities in Pacific Northwest | Pacific Northwest Home Page
Dam TypeZoned Earthfill
WatercourseNorth Fork of the Malheur River
Location15 miles north of Juntura, Oregon
Original Construction1934-1935
Modified Construction
National ID NumberOR00589
Hydrologic Unit Code

Structural Height110.0 ft
Hydraulic Height (Normal Operating Depth at Dam)80.0 ft
Top Parapet (Elevation)
Spillway Crest Elevation3323.0 ft
Crest Elevation3348.00 ft
Crest Length1850.0 ft
Crest Width
Base Width
Volume of Dam Construction Materials
Streambed at Dam Axis3260.0 ft
Top of Exclusive Flood Control Pool (Elevation)
Top of Joint Use Pool (Elevation)3340.0 ft
Top of Active Conservation Pool (Elevation)3340.0 ft
Top of Inactive Conservation Pool (Elevation)
Top of Dead Storage Pool (Elevation)3263.2 ft

Hydraulics & Hydrology
Total Water Storage at Elevation 59,212 ac-ft at 3340 ft
Maximum Water Surface Elevation
Normal Water Surface Elevation3340.0 ft
Spillway TypeConcrete-lined chute located on the right abutment, controlled by three 18-foot-wide by 17-foot-high radial gates.
Auxiliary SpillwayNo
Spillway Capacity at Elevation10,300 cfs at 3343.0 ft
Auxiliary Spillway Capacity at Elevation
Uncontrolled Spillway Capacity at Elevation
Outlet Works Capacity at Elevation600 cfs at 3340.0 ft
Diversion Capacity at Elevation
Drainage Area444.0 sq mi
Hydrometeorological Report (HMR)HMR 57

Contact Information
TitleArea Office Manager
OrganizationSnake River Area Office
Address230 Collins Road
CityBoise, ID 83702-4520
Phone (Fax)208 383-2275
Phone (Office)208 383-2248
OrganizationVale Oregon Irrigation District
Address521 'A' Street West
CityVale, OR 97918-1103
Phone (Office)541 473-3951

Last updated: Nov 21, 2012