Columbia Mills
Columbia Mills is a gravity dam located in Ozaukee County, Wisconsin, built in 1914. It carries a Low hazard potential classification and has a fair condition assessment.
About Columbia Mills
The primary purpose of Columbia Mills 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 15 feet tall and stretches 95 feet across, creates a reservoir covering 15 acres, has a maximum storage capacity of 80 acre-feet, and collects water from a drainage area of 121 square miles. Completed in 1914, 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. An emergency action plan is in place for this dam. The most recent inspection on record was 06/16/2020.
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Location
| State | Wisconsin |
| County | Ozaukee |
| Nearest City | Cedarburg |
| River/Stream | Cedar Creek |
| Coordinates | 43.30032, -87.97515 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 95 ft |
| Year Completed | 1914 (112 years old) |
Storage & Hydraulics
| NID Storage | 80 acre-ft |
| Max Storage | 80 acre-ft |
| Normal Storage | 35 acre-ft |
| Surface Area | 15 acres |
| Drainage Area | 121 sq mi |
| Max Discharge | 5,334 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | City of Cedarburg |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 06/16/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WI00283 |
| Federal ID | WI00283 |
| More Info | State Dam Safety Program |