Wickiup Dam


Wickiup Dam, with a total capacity of 200,000 acre-feet (active 200,000 acre-feet), completed in 1949, stores water for the irrigation of lands in the North Unit Irrigation District. The dam is a zoned earthfill structure, 100 feet high, with a crest length of 13,860 feet. The dam and dike contain 1,852,000 cubic yards of material. The East Dike closes a low area on the east side of the reservoir, and has a crest length of 3,420 feet. The spillway is an open rock cut with concrete sill at the north end of the East Dike.


Wickiup Dam and Reservoir are situated in forest covered volcanic mountains, consisting of buttes, craters and intervening sediment covered basins.  The intermittent out-pouring of lava flows and explosive volcanic activity has created very complex geologic situations in local areas.  The porous lava flows, breccia, ash and deposits of water lain sediment can be linked to a huge absorptive sponge with local perched or depressed water tables, where lakes and springs have been created at various elevations, according to the rate of inflow or outflow of water as it adjusts to local topographic and geologic conditions.   The readjustments of the earth's crust during and following volcanic activity undoubtedly created huge cracks, fissures and faults through which the surface water can be lost or move to lower subsurface elevations.

RegionFacilities in Pacific Northwest | Pacific Northwest Home Page
Dam TypeZoned Earthfill
WatercourseDeschutes River
Original Construction1939-1949
Modified Construction
National ID NumberOR10022
Hydrologic Unit Code

Structural Height100.0 ft
Hydraulic Height (Normal Operating Depth at Dam)81.0 ft
Top Parapet (Elevation)
Spillway Crest Elevation4347.0 ft
Crest Elevation4347.0 ft
Crest Length13860.0 ft
Crest Width
Base Width
Volume of Dam Construction Materials
Streambed at Dam Axis4258.0 ft
Top of Exclusive Flood Control Pool (Elevation)
Top of Joint Use Pool (Elevation)
Top of Active Conservation Pool (Elevation)4337.66 ft
Top of Inactive Conservation Pool (Elevation)4265.0 ft
Top of Dead Storage Pool (Elevation)4259.7 ft

Hydraulics & Hydrology
Total Water Storage at Elevation 200,000 ac-ft
Maximum Water Surface Elevation
Normal Water Surface Elevation4337.66 ft
Spillway Type Emergency unaged with stop logs and fuseplug
Auxiliary SpillwayNo
Spillway Capacity at Elevation5,000 cfs at 4341.38 ft
Auxiliary Spillway Capacity at Elevation
Uncontrolled Spillway Capacity at Elevation
Outlet Works Capacity at Elevation4,000 cfs at 4337.66 ft
Diversion Capacity at Elevation
Drainage Area
Hydrometeorological Report (HMR)
Probable Maximum Flood (PMF) Report

Contact Information
TitleArea Office Manager
OrganizationColumbia-Cascades Area Office
Address1917 Marsh Road
CityYakima, WA 98901-2058
Phone (Fax)509 454-5611
Phone (Office)509 575-5848 x202
OrganizationNorth Unit Irrigation District
Address2024 NW Beach St
CityMadras, OR 97741-9484
Phone (Office)541 475-3625

Last updated: Jun 21, 2012