Mill Creek 22
Mill Creek 22 is an earth dam located in Richland County, Wisconsin, built in 1961. It carries a High hazard potential classification and has a fair condition assessment.
About Mill Creek 22
The primary purpose of Mill Creek 22 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 Tr West Branch Mill Creek.
The dam stands 25 feet tall and stretches 410 feet across, has a maximum storage capacity of 52 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1961, the structure is well into its service life at over 50 years old.
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 06/01/2022.
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 | Richland |
| Nearest City | None |
| River/Stream | Tr West Branch Mill Creek |
| Coordinates | 43.40699, -90.61167 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 410 ft |
| Year Completed | 1961 (65 years old) |
Storage & Hydraulics
| NID Storage | 52 acre-ft |
| Max Storage | 52 acre-ft |
| Drainage Area | 1 sq mi |
| Max Discharge | 57 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Richland County |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Fair |
| Last Inspection | 06/01/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WI00390 |
| Federal ID | WI00390 |
| More Info | State Dam Safety Program |