ID00275 - Minidoka Dam


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Minidoka Dam


	Statistics

General

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

County ................................ Minidoka & Cassia

Project: ................................ Minidoka
Dam type: ........................... Earthfill

Location: ............................ 6 mi S of Minidoka

Watercourse: ..................... Snake River

Reservoir: ........................... Lake Walcott

Construction Date: ............1904-1906

National ID Number .......... ID00275

Hydrologic Unit Code .....

Dimensions

Crest Elevation of Dam: ..................... 4249.3 ft
Structural Height of Dam: ...................... 86.0 ft
Crest Length: ....................................... 4475.0 ft
Top of Joint Use: ......................................... NA
Top of Active Conservation: ............ 4245.0 ft
Top of Inactive Conservation: ...........4236.0 ft
Spillway Crest: ......................................4228.0 ft
Top of Dead Storage: ......................... 4192.0 ft
Streambed at Dam Axis : .................... 4172.0 ft

Hydraulics

Normal Water Surface Elev: ............... 4245.0 ft
Hydraulic Height: .................................... 74.0 ft
Service Spillway Type:

Uncontrolled Crest ............................... Yes

Morning-Glory ........................................... No
Crest Length .................................... 2,385 ft
Gated ...................................................... No

Capacity at Elev: 4245.0 ft, 89,000 cfs

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

Capacity at Elev. .................................... NA

Outlet Works Capacity at

Elevation 4245.00 ft., ....................24,125 cfs

Hydrology

Drainage Area: ............................... 2231.0 sq mi

Hydrometeorological Report(HMR): HMR 43
Flood Type: ............................... Winter General

Storm Duration: ........................................ 72 hrs

Probable Maximum Flood (PMF) Report:

Peak Inflow: ...................................... 88,100 cfs

Inflow Volume: ......................... 718,700 acre-ft

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

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

Initial Routing Elev: ........................... 4245.0 ft

Study Date: ............................... February 1984

Power Generation

Power Generation at Dam Site - Minidoka Powerplant
Bureau of Reclamation Power Program

Narration

Geology

The geology of the area between Minidoka Dam and Arrowhead Dam is complex. The mountain masses have been extensively folded and faulted. They are made up of crystalline, metamorphic, volcanic, and consolidated sedimentary rock ranging in age from Precambrian to Quaternary. The valleys are structurally depressed areas containing large deposits of volcanic rock, lake sediments, alluvial and fluvioglacial deposits, and windblown silts. The valley deposits have been collecting from early or middle Tertiary time to present.

Miscellaneous Links

| Upper Snake River Basin Reservoir Storage | Minidoka National Wildlife Refuge |

Links

| Recreation | Lake Walcott - Boat Ramp Elevations |

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

| Owner: Bureau of Reclamation, Snake River Area Office - East,
1359 Hansen Avenue, Burley, ID 83318-1821, (208) 678-0461

| Operator: Bureau of Reclamation, Snake River Area Office - East,
1359 Hansen Avenue, Burley, ID 83318-1821, (208) 678-0461

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