Mirror Lake Dam
Mirror Lake Dam is an earth dam located in Adams County, North Dakota, built in 1909. It carries a Significant hazard potential classification.
About Mirror Lake Dam
The primary purpose of Mirror Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Hettinger Park Board (local government). It impounds the Flat Creek near Hettinger.
The dam stands 19 feet tall and stretches 800 feet across, creates a reservoir covering 94 acres, and has a maximum storage capacity of 894 acre-feet. Completed in 1909, the structure is over a century old.
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. The most recent inspection on record was 08/31/2022.
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Location
| State | North Dakota |
| County | Adams |
| Nearest City | Hettinger |
| River/Stream | Flat Creek |
| Coordinates | 45.99399, -102.63482 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 19 ft |
| Dam Height | 19 ft |
| Dam Length | 800 ft |
| Year Completed | 1909 (117 years old) |
Storage & Hydraulics
| NID Storage | 894 acre-ft |
| Max Storage | 894 acre-ft |
| Normal Storage | 573 acre-ft |
| Surface Area | 94 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Hettinger Park Board |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Not Rated |
| Last Inspection | 08/31/2022 |
| Emergency Action Plan | No |
Identifiers
| NID ID | ND00137 |
| Federal ID | ND00137 |
| More Info | State Dam Safety Program |