Mcnett is an earth dam located in Lafayette County, Wisconsin, built in 1971. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 40 ft40 ft tall and 1,100 ft long, taller than 86% of U.S. dams with a recorded height. 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 Mcnett
The primary purpose of Mcnett is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Patten Land Holding, LLC (private). It impounds the Cottage Inn Branch-pecatonica.
The dam stands 40 feet tall and stretches 1,100 feet across, creates a reservoir covering 55 acres, has a maximum storage capacity of 1,000 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1971, 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 10/31/2017.
At 40 feet, this dam is taller than 86% of dams nationwide.
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Location
| State | Wisconsin |
| County | Lafayette |
| Nearest City | None |
| River/Stream | Cottage Inn Branch-pecatonica |
| Coordinates | 42.77765, -90.29198 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 40 ft |
| Dam Height | 40 ft |
| Dam Length | 1,100 ft |
| Year Completed | 1971 (55 years old) |
Storage & Hydraulics
| NID Storage | 1,000 acre-ft |
| Max Storage | 1,000 acre-ft |
| Normal Storage | 600 acre-ft |
| Surface Area | 55 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 150 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Patten Land Holding, LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 10/31/2017 |
| Emergency Action Plan | No |
Identifiers
| NID ID | WI00994 |
| Federal ID | WI00994 |
| More Info | State Dam Safety Program |