Lake Ossawinnamakee
Lake Ossawinnamakee is a gravity dam located in Crow Wing County, Minnesota, built in 1937. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Lake Ossawinnamakee
The primary purpose of Lake Ossawinnamakee is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Mndnr (state). It impounds the Pelican Brook near Riverton.
The dam stands 10 feet tall and stretches 48 feet across, creates a reservoir covering 662 acres, has a maximum storage capacity of 10,744 acre-feet, and collects water from a drainage area of 47 square miles. Completed in 1937, the structure is well-established, with more than 75 years of service.
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. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 06/29/2018.
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Location
| State | Minnesota |
| County | Crow Wing |
| Nearest City | Riverton |
| River/Stream | Pelican Brook |
| Coordinates | 46.62739, -94.16867 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 48 ft |
| Year Completed | 1937 (89 years old) |
Storage & Hydraulics
| NID Storage | 10,744 acre-ft |
| Max Storage | 10,744 acre-ft |
| Normal Storage | 8,812 acre-ft |
| Surface Area | 662 acres |
| Drainage Area | 47 sq mi |
| Max Discharge | 1,235 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | MNDNR |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/29/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MN00047 |
| Federal ID | MN00047 |
| More Info | State Dam Safety Program |