Cold Springs Dam

Overview

Cold Springs Dam is a zoned earthfill type with a structural height of 115 feet and a volume of 793,000 cubic yards. Cold Springs Reservoir is located offstream about 6 miles northeast of Hermiston, Oregon. Water is diverted to the reservoir from the Umatilla River by the Feed Canal Diversion Dam and Canal. The reservoir’s total active capacity is 39,260 acre-feet (active 38,646 acre-feet).

Safety of Dams work in 1994-1995 included the construction of an interceptor trench and drain at the downstream toe of the embankment, a downstream stability berm, extension of the wing dikes, replacement of the spillway with an enlarged roller compacted concrete structure, and a new Feed Canal backflow structure.

Geology

A few large exposures of basaltic lave bedrock (Columbia River basalt) can be seen on the valley sides downstream from the dam; alluvium and/or windblown silt cover hut throughout most of the area bedrock.  The alluvium appears to be chiefly sand, but beds of gravel and numerous cobbles and boulders can be seen at various places. The alluvium is thick, widespread deposit from a tremendous flood, which covered the area in late glacial times. In the spillway area bedrock is exposed only near the downstream end of the chute along the left wall. In this exposure the basalt is rather soft, crumbly and closely jointed. It is not highly resistant to erosion. Small exposures of basalt can be found at several places in the right hillside between the creek and spillway, but no rock was recognized on the right side of the spillway except at the downstream end. In a cliff along the right canyon wall about 300 feet left (east) of the spillway a considerable thickness of hard, fresh highly resistant basalt also occurs.


General
RegionFacilities in Pacific Northwest | Pacific Northwest Home Page
StateOregon
CountyUmatilla
ProjectUmatilla Basin
Dam Type
ReservoirCold Springs
WatercourseOff-stream
Location
Longitude-119.173679
Latitude45.8592328
Original Construction1908
Modified Construction
National ID NumberOR00590
Hydrologic Unit Code

Dimensions
Structural Height115.0 ft
Hydraulic Height (Normal Operating Depth at Dam)94.0 ft
Top Parapet (Elevation)
Spillway Crest Elevation622.25 ft
Crest Elevation629.90 ft
Crest Length3,450.00 ft
Crest Width
Base Width
Volume of Dam Construction Materials
Streambed at Dam Axis536.00 ft
Top of Exclusive Flood Control Pool (Elevation)
Top of Joint Use Pool (Elevation)
Top of Active Conservation Pool (Elevation)621.50 ft
Top of Inactive Conservation Pool (Elevation)
Top of Dead Storage Pool (Elevation)571.2 ft

Hydraulics & Hydrology
Volume
Total Water Storage at Elevation
Maximum Water Surface Elevation
Normal Water Surface Elevation621.50 ft
Spillway Type
Auxiliary SpillwayNo
Spillway Capacity at Elevation6000.00 cfs at 626.00 ft
Auxiliary Spillway Capacity at Elevation
Uncontrolled Spillway Capacity at Elevation
Outlet Works Capacity at Elevation600.00 cfs at 623.00 ft
Diversion Capacity at Elevation
Drainage Area186.00 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
OrganizationHermiston Irrigation District
Address366 East Hurlburt Ave.
CityHermiston, OR 97838
Phone (Office)541 567-3024


Last updated: May 04, 2012