Tri Creek Number One is an earth dam located in Monroe County, Wisconsin, built in 1976. It carries a High hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 57 ft57 ft tall and 1,265 ft long, taller than 94% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Tri Creek Number One
The primary purpose of Tri Creek Number One 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 Monroe County (local government). It impounds the Tr Morris Creek near Norwalk.
The dam stands 57 feet tall and stretches 1,265 feet across, creates a reservoir covering 23 acres, has a maximum storage capacity of 2,400 acre-feet, and collects water from a drainage area of 4 square miles. Completed in 1976, the structure is 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 05/06/2021.
At 57 feet, this dam is taller than 94% of dams nationwide.
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 | Monroe |
| Nearest City | Norwalk |
| River/Stream | Tr Morris Creek |
| Coordinates | 43.85634, -90.62866 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 57 ft |
| Dam Height | 57 ft |
| Dam Length | 1,265 ft |
| Year Completed | 1976 (50 years old) |
Storage & Hydraulics
| NID Storage | 2,400 acre-ft |
| Max Storage | 2,400 acre-ft |
| Normal Storage | 120 acre-ft |
| Surface Area | 23 acres |
| Drainage Area | 4 sq mi |
| Max Discharge | 18,225 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Monroe County |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/06/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WI00806 |
| Federal ID | WI00806 |
| More Info | State Dam Safety Program |