Olga Dam, also known as Tongue River WS Dam T3-2, is a local government-owned structure located in Cavalier, North Dakota.
Wind
Humidity
Built in 1955 by USDA NRCS, this earth dam stands at a height of 65 feet and spans a length of 360 feet along the Tongue River. Its primary purpose is flood risk reduction, with a storage capacity of 961.3 acre-feet and a surface area of 3.9 acres.
Managed by the North Dakota State Water Commission, Olga Dam is regulated, permitted, inspected, and enforced by NDSWC to ensure its structural integrity and operational safety. The dam features an uncontrolled spillway with a width of 200 feet and a single valve outlet gate. In 1984, structural modifications were made to enhance its flood risk reduction capabilities, aligning with its low hazard potential and moderate risk assessment rating.
Despite being classified as "Not Rated" in terms of condition assessment, Olga Dam serves as a crucial infrastructure for mitigating flood risks in the region. With its historical significance and ongoing maintenance efforts, this dam stands as a testament to the collaborative efforts between local and state agencies to safeguard water resources and address climate-related challenges in North Dakota.
Years Modified |
1984 - Structural |
Year Completed |
1955 |
Dam Length |
360 |
Dam Height |
65 |
River Or Stream |
TONGUE RIVER |
Primary Dam Type |
Earth |
Surface Area |
3.9 |
Drainage Area |
3.3 |
Nid Storage |
961.3 |
Structural Height |
69 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
69 |
Little South Pembina River Nr Walhalla
|
5cfs |
Pembina River At Walhalla
|
138cfs |
Tongue River At Akra
|
53cfs |
Pembina River At Neche
|
188cfs |
Park River At Grafton
|
26cfs |
Red River Of The North At Drayton
|
1650cfs |
| Location | Reservations | Toilets |
|---|---|---|
Legion - Mountain
|
||
Walhalla Riverside City Park
|
||
Icelandic State Park
|