Deadwood Dam is located in west-central Idaho on the Deadwood River about 25 miles above its confluence with the South Fork of the Payette River and about 90 miles above Black Canyon Diversion Dam. The damsite is located in a narrow canyon where the Deadwood River has cut into granite bedrock, approximately 53 miles northeast of Boise, Idaho. The dam lies on the western slope of the Sawtooth Mountains with elevations in the basin varying from 5311 feet by the dam to about 8,696 feet at Price Peak. Deadwood Reservoir is three and one half miles long and covers 3,180 acres. Deadwood Dam is a concrete-arch structure with a structural height of 165 feet and a total capacity of 154,000 acre-feet, providing a regulated flow for the powerplant at Black Canyon Diversion Dam and for irrigation in the Payette Division and Emmett Irrigation District.
Geology
Foundation: Hard, sound granite, massive at left abutment and fissured with sheet and block joints at right abutment. Two tightly filled fault-zone seams cross foundation on right side.
General
Project
Boise
Dam Type
Concrete Arch
Location
25 mi SE of Cascade, ID
Longitude
-115.6459458
Latitude
44.2932322
Watercourse
Deadwood River
Reservoir
Deadwood
Original Construction
1929-1931
National ID Number
ID00284
Base Width
62 ft
Dimensions
Crest Elevation
5340.0 ft
Top Parapet (Elevation)
5343.5 ft
Structural Height
165.0 ft
Hydraulic Height (Normal Operating Depth at Dam)
137.0 ft
Crest Width
9 ft
Volume of Dam Construction Materials
56,400 cu yd
Spillway Crest Elevation
5334.0 ft
Top of Active Conservation Pool (Elevation)
5334.0 ft
Crest Length
749.0 ft
Hydraulics & Hydrology
Total Water Storage at Elevation
154,000 ac-ft at 5334.0 ft
Spillway Capacity at Elevation
11,300 cfs at 5343.5 ft
Outlet Works Capacity at Elevation
2,600 cfs at 5334.0 ft
Drainage Area
110.7 sq mi
Hydrometeorological Report (HMR)
HMR 57
Maximum Water Surface Elevation
5345.52 ft
Normal Water Surface Elevation
5334.0 ft
Spillway Type
Uncontrolled overflow section near center of the dam
Contact
Owner
Title: Area Office Manager Organization: Snake River Area Office Address: 230 Collins Road City: Boise, ID 83702-4520 Fax: 208-383-2275 Phone: 208-383-2248
Operator
Title: Area Office Manager Organization: Snake River Area Office Address: 230 Collins Road City: Boise, ID 83702-4520 Fax: 208-383-2275 Phone: 208-383-2248
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