Olga Dam is an earth dam located in Cavalier County, North Dakota, built in 1955. It carries a Low hazard potential classification.
Dam profile
NID height · 69 ft69 ft tall and 360 ft long, taller than 96% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Olga Dam
The primary purpose of Olga Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Pembina & Cavalier Co Wrb (local government). It impounds the Tongue River near Concrete.
The dam stands 69 feet tall and stretches 360 feet across, creates a reservoir covering 3 acres, has a maximum storage capacity of 961 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1955, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. The most recent inspection on record was 06/12/2013. That was over 13 years ago.
At 69 feet, this dam is taller than 96% of all dams in the United States.
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Location
| State | North Dakota |
| County | Cavalier |
| Nearest City | Concrete |
| River/Stream | Tongue River |
| Coordinates | 48.78808, -98.00197 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 69 ft |
| Dam Height | 65 ft |
| Dam Length | 360 ft |
| Year Completed | 1955 (71 years old) |
Storage & Hydraulics
| NID Storage | 961 acre-ft |
| Max Storage | 961 acre-ft |
| Normal Storage | 30 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 3 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Pembina & Cavalier Co Wrb |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 06/12/2013 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | ND00044 |
| Federal ID | ND00044 |
| More Info | State Dam Safety Program |