Heron Lake Outlet
Heron Lake Outlet is a gravity dam located in Jackson County, Minnesota, built in 1937. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Heron Lake Outlet
The primary purpose of Heron Lake Outlet is fish and wildlife pond. The dam creates habitat for fish and wildlife, supporting local ecosystems and potentially serving conservation goals. The dam is owned by Mndnr-wildlife (state). It impounds the Heron Lake Outlet near Windom.
The dam stands 10 feet tall and stretches 133 feet across, creates a reservoir covering 2,845 acres, has a maximum storage capacity of 100,000 acre-feet, and collects water from a drainage area of 448 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 11/15/2018.
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Location
| State | Minnesota |
| County | Jackson |
| Nearest City | Windom |
| River/Stream | Heron Lake Outlet |
| Coordinates | 43.79732, -95.28630 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 10 ft |
| Dam Height | 7 ft |
| Dam Length | 133 ft |
| Year Completed | 1937 (89 years old) |
Storage & Hydraulics
| NID Storage | 100,000 acre-ft |
| Max Storage | 100,000 acre-ft |
| Normal Storage | 72,571 acre-ft |
| Surface Area | 2,845 acres |
| Drainage Area | 448 sq mi |
| Max Discharge | 4,889 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fish and Wildlife Pond |
| Owner | MNDNR-Wildlife |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/15/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MN00115 |
| Federal ID | MN00115 |
| More Info | State Dam Safety Program |