Merton Rolling Mill
Merton Rolling Mill is a gravity dam located in Waukesha County, Wisconsin, built in 1840. It carries a High hazard potential classification and has a fair condition assessment.
About Merton Rolling Mill
The primary purpose of Merton Rolling Mill is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Village Of Merton (local government). It impounds the Bark near Merton,hartford.
The dam stands 10 feet tall and stretches 700 feet across, creates a reservoir covering 38 acres, has a maximum storage capacity of 168 acre-feet, and collects water from a drainage area of 26 square miles. Completed in 1840, the structure is one of the older dams in the region, with over a century and a half of service.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 07/20/2021.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Wisconsin dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Wisconsin |
| County | Waukesha |
| Nearest City | Merton,hartford |
| River/Stream | Bark |
| Coordinates | 43.14940, -88.30662 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 700 ft |
| Year Completed | 1840 (186 years old) |
Storage & Hydraulics
| NID Storage | 168 acre-ft |
| Max Storage | 168 acre-ft |
| Normal Storage | 90 acre-ft |
| Surface Area | 38 acres |
| Drainage Area | 26 sq mi |
| Max Discharge | 504 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Village Of Merton |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Fair |
| Last Inspection | 07/20/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WI00333 |
| Federal ID | WI00333 |
| More Info | State Dam Safety Program |