Mill Creek 13b is an earth dam located in Richland County, Wisconsin, built in 1962. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 30 ft30 ft tall and 560 ft long, taller than 68% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Mill Creek 13b
The primary purpose of Mill Creek 13b 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 East Branch Mill Creek.
The dam stands 30 feet tall and stretches 560 feet across, creates a reservoir covering 1 acres, has a maximum storage capacity of 150 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1962, the structure is well into its service life at over 50 years old.
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 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.
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Location
| State | Wisconsin |
| County | Richland |
| Nearest City | None |
| River/Stream | Tr East Branch Mill Creek |
| Coordinates | 43.39135, -90.49740 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 560 ft |
| Year Completed | 1962 (64 years old) |
Storage & Hydraulics
| NID Storage | 150 acre-ft |
| Max Storage | 150 acre-ft |
| Normal Storage | 3 acre-ft |
| Surface Area | 1 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 73 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Richland County |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 06/01/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WI00387 |
| Federal ID | WI00387 |
| More Info | State Dam Safety Program |