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Conconully is a historic earth dam located in Okanogan, Washington, built in 1909 by the Bureau of Reclamation for irrigation purposes.
Standing at 72 feet tall with a hydraulic height of 63 feet, it harnesses the waters of Salmon Creek, providing a maximum storage capacity of 16,570 acre-feet and servicing a drainage area of 5 square miles. The dam covers a surface area of 450 acres and boasts a spillway width of 149 feet for uncontrolled discharge, with a maximum capacity of 11,580 cubic feet per second.
Managed by the Bureau of Reclamation, Conconully's hazard potential is classified as high, with a moderate risk assessment score of 3. The dam has not undergone a recent condition assessment, but emergency action plans have been prepared, last revised in September 2020. While the dam has not been modified in recent years, it remains a critical piece of infrastructure for the surrounding area, providing essential irrigation water to support agricultural activities. With its rich history and significant role in water resource management, Conconully stands as a testament to the importance of infrastructure in sustaining communities and ecosystems in Washington state.
Okanogan River Near Tonasket
|
6690cfs |
Okanogan River At Malott
|
6220cfs |
Omak Creek Near Omak
|
8cfs |
Methow River At Winthrop
|
4360cfs |
Chewuch River At Winthrop
|
1820cfs |
Methow River At Twisp
|
5450cfs |
Year Completed |
1909 |
Dam Length |
1075 |
Dam Height |
72 |
River Or Stream |
SALMON CREEK |
Primary Dam Type |
Earth |
Surface Area |
450 |
Hydraulic Height |
63 |
Drainage Area |
5 |
Nid Storage |
16570 |
Structural Height |
72 |
Hazard Potential |
High |
Foundations |
Rock |
Nid Height |
72 |
| Location | Reservations | Toilets |
|---|---|---|
Conconully State Park
|
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Cottonwood - Ton
|
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Oriole Campground
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Oriole
|
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Kootenai Camp
|
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Sugarloaf Campground
|
Salmon Creek
Pasayten Wilderness Boundary To Okanogan Nf Boundary
Lake Chelan-Sawtooth Wilderness Boundary To Okanogan Nf Boundary
Private Land Boundary To Okanogan Nf Boundary
Confluence With Tungsten Creek To Pasayten Wilderness Boundary
Confluence Of South Fork Wolf Creek To Lake Chelan-Sawtooth Wilderness Boundary