Cle Elum Dam

Overview

Cle Elum Dam, on the Cle Elum River 10 miles northwest of Cle Elum, is an earthfill dam constructed at the end of a natural lake that forms a reservoir with an active capacity of  436,900 acre-feet.  The dam is 165 feet high and, including the dikes, contains 1,411,000 cubic yards of material.

The outlet works of Cle Elum Dam were modified in 1977-1979 under the Bureau of Reclamation’s Safety of Dams Program.

Geology

Cle Elum Dam and Lake Cle Elum lie within the U-shaped glacial valley of the Cle Elum River. Successive multiple advances of alpine glaciers during the Pleistocene have formed this U-shaped valley. The terminal moraine/outwash complex, which was deposited during the most recent Pleistocene glacial advance, essentially blocked drainage of the valley forming a natural dam. Following deglaciation, a lake was formed behind the terminal moraine. The moraine was subsequently breached, and a deep channel was incised through the moraine and outwash deposits, forming the outlet of the glacial lake currently known as Lake Cle Elum. The high-stand water level of the glacial lake was very close to the maximum water surface of the existing Lake Cle Elum. Cle Elum Dam, main dike, and three smaller saddle dikes are sited along the crest of the youngest terminal moraine described above. This glacial moraine received its name, Domerie, after the Domerie Flats, an extensive outwash terrace immediately downstream from the dam. The moraine, which is about 60,000 to 65,000 years old, consists of unconsolidated sediments ranging in size from rock flour to boulders. Its thickness is estimated from drill hole investigations downstream of the dam. Investigations at the dam site have never penetrated the glacial moraine to bedrock. Bedrock in the vicinity of Cle Elum Dam includes various volcanic and sedimentary units.


General
RegionFacilities in Pacific Northwest | Pacific Northwest Home Page
StateWashington
CountyKittitas
ProjectYakima
Dam TypeZoned Earthfill
ReservoirCle Elum Lake
WatercourseCle Elum River
Location
Longitude-121.073112
Latitude47.2469
Original Construction1931-1933
Modified Construction
National ID NumberWA00274
Hydrologic Unit Code

Dimensions
Structural Height165.0 ft
Hydraulic Height (Normal Operating Depth at Dam)124.0 ft
Top Parapet (Elevation)
Spillway Crest Elevation2240.0 ft
Crest Elevation2250.0 ft
Crest Length1800.0 ft
Crest Width
Base Width
Volume of Dam Construction Materials
Streambed at Dam Axis2116.4 ft
Top of Exclusive Flood Control Pool (Elevation)
Top of Joint Use Pool (Elevation)
Top of Active Conservation Pool (Elevation)2240.0 ft
Top of Inactive Conservation Pool (Elevation)
Top of Dead Storage Pool (Elevation)2210.0 ft

Hydraulics & Hydrology
Total Water Storage at Elevation436,900 ac-ft
Maximum Water Surface Elevation
Normal Water Surface Elevation2240.0 ft
Spillway TypeRadial gates
Auxiliary SpillwayNo
Spillway Capacity at Elevation40,000 cfs at 2240.0 ft
Auxiliary Spillway Capacity at Elevation
Uncontrolled Spillway Capacity at Elevation
Outlet Works Capacity at Elevation4,600 cfs
Diversion Capacity at Elevation
Drainage Area260.0 sq mi
Hydrometeorological Report (HMR)HMR 57
Probable Maximum Flood (PMF) Report

Contact Information
Owner
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
Operator
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


Last updated: Mar 11, 2009