Merillan Mills is a gravity dam located in Jackson County, Wisconsin, built in 1907. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 23 ft23 ft tall and 250 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 Merillan Mills
The primary purpose of Merillan Mills is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Village of Merrillan (local government). It impounds the Halls Creek near Merrillan.
The dam stands 23 feet tall and stretches 250 feet across, creates a reservoir covering 16 acres, has a maximum storage capacity of 170 acre-feet, and collects water from a drainage area of 45 square miles. Completed in 1907, the structure is over a century 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 07/25/2016. That was over 10 years ago.
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Location
| State | Wisconsin |
| County | Jackson |
| Nearest City | Merrillan |
| River/Stream | Halls Creek |
| Coordinates | 44.44762, -90.84155 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 23 ft |
| Dam Height | 23 ft |
| Dam Length | 250 ft |
| Year Completed | 1907 (119 years old) |
Storage & Hydraulics
| NID Storage | 170 acre-ft |
| Max Storage | 170 acre-ft |
| Normal Storage | 76 acre-ft |
| Surface Area | 16 acres |
| Drainage Area | 45 sq mi |
| Max Discharge | 2,750 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Village of Merrillan |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 07/25/2016 |
| Emergency Action Plan | No |
Identifiers
| NID ID | WI00045 |
| Federal ID | WI00045 |
| More Info | State Dam Safety Program |