Big Moon Lake is an earth dam located in Barron County, Wisconsin, built in 1968. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 9 ft9 ft tall and 500 ft long. 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 Big Moon Lake
The primary purpose of Big Moon Lake is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Barron County (local government). It impounds the Moon Creek near Prairie Farm.
The dam stands 9 feet tall and stretches 500 feet across, creates a reservoir covering 187 acres, has a maximum storage capacity of 2,000 acre-feet, and collects water from a drainage area of 7 square miles. Completed in 1968, the structure is well into its service life at over 50 years old.
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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 09/15/2020.
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Location
| State | Wisconsin |
| County | Barron |
| Nearest City | Prairie Farm |
| River/Stream | Moon Creek |
| Coordinates | 45.34468, -92.11037 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 9 ft |
| Dam Height | 9 ft |
| Dam Length | 500 ft |
| Year Completed | 1968 (58 years old) |
Storage & Hydraulics
| NID Storage | 2,000 acre-ft |
| Max Storage | 2,000 acre-ft |
| Normal Storage | 900 acre-ft |
| Surface Area | 187 acres |
| Drainage Area | 7 sq mi |
| Max Discharge | 660 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Barron County |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 09/15/2020 |
| Emergency Action Plan | No |
Identifiers
| NID ID | WI00486 |
| Federal ID | WI00486 |
| More Info | State Dam Safety Program |