Tolna Dam 1 is an earth dam located in Nelson County, North Dakota, built in 1936. It carries a Significant hazard potential classification.
Dam profile
NID height · 36 ft36 ft tall and 520 ft long, taller than 82% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Tolna Dam 1
The primary purpose of Tolna Dam 1 is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Nelson County Wrb (local government). It impounds the Tolna Coulee near N.
The dam stands 36 feet tall and stretches 520 feet across, creates a reservoir covering 166 acres, has a maximum storage capacity of 3,080 acre-feet, and collects water from a drainage area of 40 square miles. Completed in 1936, the structure is well-established, with more than 75 years of service.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. An emergency action plan is in place for this dam. The most recent inspection on record was 05/09/2018.
At 36 feet, this dam is taller than 82% of dams nationwide.
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Location
| State | North Dakota |
| County | Nelson |
| Nearest City | N |
| River/Stream | Tolna Coulee |
| Coordinates | 47.80448, -98.39428 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 36 ft |
| Dam Height | 30 ft |
| Dam Length | 520 ft |
| Year Completed | 1936 (90 years old) |
Storage & Hydraulics
| NID Storage | 3,080 acre-ft |
| Max Storage | 3,080 acre-ft |
| Normal Storage | 2,027 acre-ft |
| Surface Area | 166 acres |
| Drainage Area | 40 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Nelson County Wrb |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 05/09/2018 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | ND00027 |
| Federal ID | ND00027 |
| More Info | State Dam Safety Program |