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.

High HazardFair ConditionEmergency Action Plan: Yes

Location

StateWisconsin
CountyWaukesha
Nearest CityMerton,hartford
River/StreamBark
Coordinates43.14940, -88.30662

Physical Characteristics

Dam TypeGravity
NID Height10 ft
Dam Height10 ft
Dam Length700 ft
Year Completed1840 (186 years old)

Storage & Hydraulics

NID Storage168 acre-ft
Max Storage168 acre-ft
Normal Storage90 acre-ft
Surface Area38 acres
Drainage Area26 sq mi
Max Discharge504 cfs
Spillway TypeControlled

Ownership & Safety

PurposeRecreation
OwnerVillage Of Merton
Owner TypeLocal Government
Hazard ClassificationHigh
Condition AssessmentFair
Last Inspection07/20/2021
Emergency Action PlanYes

Identifiers

NID IDWI00333
Federal IDWI00333
More InfoState Dam Safety Program

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