Cedarburg Woolen Mill is a gravity dam located in Ozaukee County, Wisconsin, built in 1864. It carries a Significant hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 18 ft18 ft tall and 130 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 Cedarburg Woolen Mill
The primary purpose of Cedarburg Woolen Mill is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by City of Cedarburg (local government). It impounds the Cedar Creek near Cedarburg.
The dam stands 18 feet tall and stretches 130 feet across, creates a reservoir covering 6 acres, has a maximum storage capacity of 50 acre-feet, and collects water from a drainage area of 119 square miles. Completed in 1864, the structure is one of the older dams in the region, with over a century and a half of service.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. An emergency action plan is in place for this dam. The most recent inspection on record was 06/22/2018.
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Location
| State | Wisconsin |
| County | Ozaukee |
| Nearest City | Cedarburg |
| River/Stream | Cedar Creek |
| Coordinates | 43.30152, -87.98869 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 130 ft |
| Year Completed | 1864 (162 years old) |
Storage & Hydraulics
| NID Storage | 50 acre-ft |
| Max Storage | 50 acre-ft |
| Normal Storage | 20 acre-ft |
| Surface Area | 6 acres |
| Drainage Area | 119 sq mi |
| Max Discharge | 4,300 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | City of Cedarburg |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 06/22/2018 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WI00168 |
| Federal ID | WI00168 |
| More Info | State Dam Safety Program |