Mill Creek 3
Mill Creek 3 is an earth dam located in Richland County, Wisconsin, built in 1961. It carries a Low hazard potential classification and has a fair condition assessment.
About Mill Creek 3
The primary purpose of Mill Creek 3 is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Richland County (local government). It impounds the Core Hollow Creek near Boaz.
The dam stands 31 feet tall and stretches 680 feet across, creates a reservoir covering 1 acres, has a maximum storage capacity of 135 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1961, the structure is well into its service life at over 50 years 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 05/15/2020.
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Location
| State | Wisconsin |
| County | Richland |
| Nearest City | Boaz |
| River/Stream | Core Hollow Creek |
| Coordinates | 43.33387, -90.57271 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 31 ft |
| Dam Height | 31 ft |
| Dam Length | 680 ft |
| Year Completed | 1961 (65 years old) |
Storage & Hydraulics
| NID Storage | 135 acre-ft |
| Max Storage | 135 acre-ft |
| Normal Storage | 3 acre-ft |
| Surface Area | 1 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 340 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Richland County |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 05/15/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WI00384 |
| Federal ID | WI00384 |
| More Info | State Dam Safety Program |