OR00326 - Wasco Dam


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Wasco Dam


	Statistics

General

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

State (Map) ........................ Oregon

County ................................ Wasco

Project: ................................ Wapinitia

Dam type: .......................... Earthfill

Location: ............................ 35 mi W of Maupin

Watercourse: ..................... Clear Creek

Reservoir: ........................... Clear Lake

Construction Date: ........... 1958-1959

National ID Number ......... OR00326

Hydrologic Unit Code .....

Dimensions

Crest Elevation of Dam: ...................... 3526.0 ft

Structural Height of Dam: .................... 59.0 ft

Crest Length:: ....................................... 415.0 ft

Top of Joint Use: .................................. NA

Top of Active Conservation: ............. 3514.4 ft

Top of Inactive Conservation: .......... 3488.0 ft

Spillway Crest: .......................................3520.1 ft

Top of Dead Storage: .......................... 3479.9 ft

Streambed at Dam Axis : ......................3479.9 ft

Hydraulics

Normal Water Surface Elev: ......... 3514.4 ft

Hydraulic Height: ................................... 40.0 ft

Service Spillway Type:

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

Crest Length .......................................... NA

Gated ..................................................... No

Capacity at Elev: 3520.0 ft, ................. 170 cfs

Auxiliary Spillway ...................................... Yes

Capacity at Elev. 3526.0 ft ................ 450 cfs

Outlet Works Capacity at

Elevation 3520.0 ft .......................... 490 cfs

Hydrology

Drainage Area: ................................. 8.8 sq mi

Hydrometeorological Report HMR 57

Flood Type: ........................... Nov-Feb General

Type Storm: ..................................Winter Event

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

Probable Maximum Flood (PMF) Report:

Peak Inflow: ................................... 13,000 cfs

Inflow Volume: ........................... 14,200 acre-ft

Flow Duration: .................................... 7.5 days

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

Initial Routing Elev: ................................. NA

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

Dam modifications underway, revision likely to above data

Power Generation

Power Generation at Dam Site - None

Bureau of Reclamation Power Program

Narration

Geology

Wasco Dam is in a narrow valley with steep slide slopes. The left abutment juts out into the valley and at a height of 50 feet above the stream flattens off into a bench. Ice or glacial deposits, causing ice or glacial melt water to discharge once blocked the stream channel over a bench a few hundred feet behind the left abutment. A channel developed which extends from this rock bench to a point in the present channel a few hundred feet downstream from the dam site. Bedrock at the lowest point of the old channel is about 15 feet above the reservoir flow line. Overburden at the flow line on the right abutment consisted of 28 feet of gravel with excess sand and silt. Boulders were hard, fresh andesite 2 to 3 feet in diameter. Much of the over burden between flow line and the valley flow was undoubtedly quite permeable.

Links

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

| Owner: Lower Columbia Area Office, 1201 NE Lloyd Boulevard Suite 750,
Portland, OR 97232-1295, Phone: 503-872-2795, Fax: 503-872-2797

| Operator: Juniper Flat District Improvement Company,
53333 Reservation Road, Maupin, OR 97037-9708, (541) 328-6380