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Owyhee Dam

Picture of Owyhee Dam


Statistics

General

  • Vicinity Map
  • Region (Map) ............. Pacific Northwest
  • State (Map) .................................. Oregon
  • County ........................................ Malheur
  • Project .......................................... Owyhee
  • Dam type .............. Concrete arch gravity
  • Location ........... 11 mi SW of Adrian, OR
  • Watercourse ..................... Owyhee River
  • Reservoir ............................ Lake Owyhee
  • Original construction ............. 1928-1932
  • Modified in .............................. 1990-1993
  • National ID Number ................. OR00582
  • Hydrologic Unit Code ..................

Hydraulics

  • Total storage to
      El. 2675 ......................... 1,183,300 acre-ft
  • Service spillway
      Capacity at El. 2675 ............... 41,790 cfs
  • River outlet works
      Capacity at El. 2675 ................. 2,530 cfs
  • Tunnel No. 1 capacity ............... 1,100 cfs

Dimensions

Hydrology

  • Drainage area .......................... 10,900 sq mi
  • Hydrometeorological Report ....... HMR 57
  • PMF ............ 1994 December general storm
  • Volume ....... 1,917,000 acre-ft over 15 days
  • Peak inflow ................................. 356,000 cfs
  • Maximum water surface ................ 2702.7 ft

Geology

  • Foundation: Consists of massive rhyolite and associated pitchstone agglomerate and massive pitchstone. Foundation rock was considered slightly weathered to fresh, moderately hard, and intensely fractured to very intensely fractured. Of note, an 8- to 32-foot-wide zone of highly fractured rock was encountered during construction and was "extensively" treated. This zone strikes normal to the dam axis and is not related to faulting.


Narration

 


Links

 | Recreation | Owyhee Wild and Scenic River | Alkali Aggregate Reaction | Lake Owyhee - Boat Ramp Elevations |

 | Dams Located by State | USBR Oregon Dams | Pacific Northwest Region Dams |

 | Owner:  Bureau of Reclamation, Snake River Area Office - West,
                   230 Collins Road, Boise, ID 83703, (208) 383-2000

 | Operator:  Owyhee Irrigation District,
                        17 South First St., Nyssa, OR  97913-3894, (541) 372-3540

 

 

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