Tieton Dam

Overview

Tieton Dam, on the Tieton River about 40 miles west of Yakima, is an earthfill structure with a concrete core wall that extends from the crest to about 100 feet below the riverbed. The dam is 319 feet high and contains 2,049,000 cubic yards of material. The reservoir’s active capacity is 198,000 acre-feet.

Geology

The geologic structure of the basin has a base of shale and sandstone sediments which were subsequently overlain by the basalt flows of the Columbia River lava. As the Cascade Mountains uplifted, stream erosion cut deep canyons through the basalt and underlying rock. Subsequent to the uplift, lava flows completely covered the upper ends of the stream valleys and partly filled sections of the stream with andesite. The andesite in the canyons was later eroded away leaving the upper end of the valley still deeply buried. Glacial material and soil covers much of the valley floors and occassional terraces line the valley side.


General
RegionFacilities in Pacific Northwest | Pacific Northwest Home Page
StateWashington
CountyYakina
ProjectYakima
Dam TypeZoned Earthfill
ReservoirRimrock Lake
WatercourseTieton river
Location
Longitude-121.12808
Latitude46.657198
Original Construction1917-1925
Modified Construction
National ID NumberWA00273
Hydrologic Unit Code

Dimensions
Structural Height319.0 ft
Hydraulic Height (Normal Operating Depth at Dam)196.0 ft
Top Parapet (Elevation)
Spillway Crest Elevation2928.2 ft
Crest Elevation2935.0 ft
Crest Length920.0 ft
Crest Width
Base Width
Volume of Dam Construction Materials
Streambed at Dam Axis2730.0 ft
Top of Exclusive Flood Control Pool (Elevation)
Top of Joint Use Pool (Elevation)
Top of Active Conservation Pool (Elevation)2926.0 ft
Top of Inactive Conservation Pool (Elevation)
Top of Dead Storage Pool (Elevation)2766.0 ft

Hydraulics & Hydrology
Total Water Storage at Elevation198,000 ac-ft
Maximum Water Surface Elevation
Normal Water Surface Elevation2926.0 ft
Spillway TypeDrum gates
Auxiliary Spillway
Spillway Capacity at Elevation50,000 cfs at 2928.2 ft
Auxiliary Spillway Capacity at Elevation
Uncontrolled Spillway Capacity at Elevation
Outlet Works Capacity at Elevation2,800 cfs
Diversion Capacity at Elevation
Drainage Area187.0 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