Maple Lake is a gravity dam located in Polk County, Minnesota, built in 1942. It carries a Low hazard potential classification.
Dam profile
NID height · 8 ft8 ft tall and 50 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Maple Lake
The primary purpose of Maple Lake is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by County of Polk (local government). It impounds the Cyr Creek near Mentor.
The dam stands 8 feet tall and stretches 50 feet across, creates a reservoir covering 1,477 acres, has a maximum storage capacity of 20,352 acre-feet, and collects water from a drainage area of 15 square miles. Completed in 1942, 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. The most recent inspection on record was 10/02/2024.
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Location
| State | Minnesota |
| County | Polk |
| Nearest City | Mentor |
| River/Stream | Cyr Creek |
| Coordinates | 47.67820, -96.12480 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 8 ft |
| Dam Height | 8 ft |
| Dam Length | 50 ft |
| Year Completed | 1942 (84 years old) |
Storage & Hydraulics
| NID Storage | 20,352 acre-ft |
| Max Storage | 20,352 acre-ft |
| Normal Storage | 11,872 acre-ft |
| Surface Area | 1,477 acres |
| Drainage Area | 15 sq mi |
| Max Discharge | 735 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | County of Polk |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 10/02/2024 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MN00222 |
| Federal ID | MN00222 |
| More Info | State Dam Safety Program |