Soldiers Meadow Dam

Overview

The Soldiers Meadow Reservoir is located on Webb Creek about 6 miles southeast of Waha and has a total storage capacity of 2,370 acre-feet (active 2,370 acre-feet). In 1986, the top 25 feet of embankment at Soldiers Meadow Reservoir was replaced and the crest was raised by 7 feet. In addition, filters were incorporated into the rebuilt embankment and the spillway and outlet works were modified. This work was accomplished under Reclamation’s Safety of Dams Program.

Geology

Soldiers Meadow Dam is situated on the northeastern edge of the Columbia Plateau, a complex structural basin, several miles deep, lying between the Idaho Batholith on the east and the Cascade Ridge on the west.  The basin grades into the Basin and Range Province to the south and is bounded by the older rocks of the Northern Rocky Mountains to the north.  The Columbia Basin is characterized by the great accumulation of lave flows and volcanic debris.  The lava flows in aggregate are over a mile in thickness and are reported to have a volume that may be as large as 100,000 cubic miles.  The basaltic lavas erupted quietly along fissures and spread for great distances from their source.  Down warping and filling of the basin probably began in Eocene time, continued through Oligocene, Miocene, Pliocene and may still be in progress.


General
RegionFacilities in Pacific Northwest | Pacific Northwest Home Page
StateIdaho
CountyNezPerce
ProjectLewiston Orchards
Dam TypeZoned Earthfill
ReservoirSoldiers Meadow
WatercourseWebb Creek
LocationApproximately 25 miles southeast of Lewiston, Idaho
Longitude-116.7367
Latitude46.16727
Original Construction1923
Modified Construction
National ID NumberID10002
Hydrologic Unit Code

Dimensions
Structural Height69.0 ft
Hydraulic Height (Normal Operating Depth at Dam)52.9 ft
Top Parapet (Elevation)
Spillway Crest Elevation4517.9 ft
Crest Elevation4529.0 ft
Crest Length630.0 ft
Crest Width
Base Width
Volume of Dam Construction Materials
Streambed at Dam Axis4465.0 ft
Top of Exclusive Flood Control Pool (Elevation)
Top of Joint Use Pool (Elevation)
Top of Active Conservation Pool (Elevation)4517.9 ft
Top of Inactive Conservation Pool (Elevation)4472.9 ft
Top of Dead Storage Pool (Elevation)4473.4 ft

Hydraulics & Hydrology
Total Water Storage at Elevation2,370 ac-ft
Maximum Water Surface Elevation
Normal Water Surface Elevation4517.9 ft
Spillway TypeUngated overflow
Auxiliary SpillwayNo
Spillway Capacity at Elevation7,040 cfs at 4526.0 ft
Auxiliary Spillway Capacity at Elevation
Uncontrolled Spillway Capacity at Elevation
Outlet Works Capacity at Elevation105 cfs at 4517.9 ft
Diversion Capacity at Elevation
Drainage Area7.2 sq mi
Hydrometeorological Report (HMR)HMR 57
Probable Maximum Flood (PMF) Report

Contact Information
Owner
TitleArea Office Manager
OrganizationSnake River Area Office
Address230 Collins Road
CityBoise, ID 83702-4520
Phone (Fax)208 383-2275
Phone (Office)208 383-2248
Operator
OrganizationLewiston Orchards Irrigation District
Address1520 Powers Ave
CityLewiston, ID 83501-5899
Phone (Office)208 746-8235


Last updated: May 31, 2012