ID00279 - Anderson Ranch Dam


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Anderson Ranch Dam


	Statistics

General

Region (Map) : ................... Pacific Northwest
State (Map) ......................... Idaho

County ................................ Elmore

Project: ................................ Boise
Dam type: ........................... Earthfill

Location: ............................ Near Boise

Watercourse: ..................... SF Boise River

Reservoir: ........................... Anderson Ranch

Construction Date: .............1941-1950

National ID Number .......... ID00279

Hydrologic Unit Code ....

Dimensions

Crest Elevation of Dam: ...................... 4206.0 ft
Structural Height of Dam: ..................... 456.0 ft
Crest Length: .........................................1350.0 ft
Top of Joint Use: ...................................4196.0 ft
Top of Active Conservation: ............. 4044.0 ft
Top of Inactive Conservation: ............4039.6 ft
Spillway Crest: .......................................4174.0 ft
Top of Dead Storage: .......................... 3992.0 ft
Streambed at Dam Axis : ..................... 3866.0 ft

Hydraulics

Normal Water Surface Elev: ................ 4044.0 ft
Hydraulic Height: ....................................332.0 ft
Service Spillway Type:

Uncontrolled Crest ................................. No

Morning-Glory ............................................ No
Crest Length ............................................ NA
Gated ...................................................... Yes

Capacity at Elev: 4196.0 ft, ........ 493,200 cfs

Auxiliary Spillway .......................................... No

Capacity at Elev. ................................... 0 cfs

Outlet Works Capacity at

Elevation 4198.0 ft., ..................... 10,000 cfs

Hydrology

Drainage Area: ................................. 960.0 sq mi

Hydrometeorological Report: HMR 57
Flood Type: ............................ Nov-Feb General

Storm Duration: ...................................... 72 days

Probable Maximum Flood (PMF) Report:

Peak Inflow: .................................... 234,000 cfs

Inflow Volume: ......................... 647,000 acre-ft

Flow Duration: ..................................... 15 days

PMF Routing MWS Elev.: ........................ NA

Initial Routing Elev: ........................... 4044.0 ft

Study Date: ................................. August 1994

Power Generation

Power Generation at Dam Site - Anderson Ranch Powerplant
Bureau of Reclamation Power Program

Geology

Anderson Ranch Dam is located near the southwestern edge of Idaho Batholith which is composed of composed of a series of closely related, coarse-grained intrusions. Major normal faulting in the region includes faults in and adjacent to the batholith, faults bounding the northeast and southwest margin on the adjacent Snake River Plain, and faults forming Camas Prairie Basin east of the dam. These faults show a low to moderate seismic activity level. The dam is located in a narrow steep-sided valley cut through several hundred of igneous extrusive and extrusive rock. In the dam foundation, the rock was found to be intensely fractured and cut by numerous shears and fractures of varying widths. Several dikes were also found normal to the canyon axis. The dikes present a reduction of fractures and shears reducing the foundation permeability and making a tight foundation. Materials within the canyon include talus, colluvium, alluvium, residual soil and intact rock. These materials form the foundation of the dam And have performed well with respect to deformation and seepage.

Links

| Recreation |Anderson Ranch Reservoir - Boat Ramp Elevations |

| Dams Located by State | USBR Idaho Dams | Pacific Northwest Region Dams |

Owner: Bureau of Reclamation, Snake River Area Office - West,
230 Collins Road, Boise, ID 83703, (208) 383-2200

Operator: Bureau of Reclamation, Snake River Area Office - West,
230 Collins Road, Boise, ID 83703, (208) 383-2200