Twin Parks 4
Twin Parks 4 is an earth dam located in Iowa County, Wisconsin, built in 1965. It carries a Low hazard potential classification and has a fair condition assessment.
About Twin Parks 4
The primary purpose of Twin Parks 4 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 Iowa County (local government). It impounds the Tr Mill Creek.
The dam stands 31 feet tall and stretches 448 feet across, creates a reservoir covering 5 acres, has a maximum storage capacity of 178 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1965, 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. The most recent inspection on record was 10/08/2020.
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Location
| State | Wisconsin |
| County | Iowa |
| Nearest City | None |
| River/Stream | Tr Mill Creek |
| Coordinates | 43.03116, -90.03454 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 31 ft |
| Dam Height | 31 ft |
| Dam Length | 448 ft |
| Year Completed | 1965 (61 years old) |
Storage & Hydraulics
| NID Storage | 178 acre-ft |
| Max Storage | 178 acre-ft |
| Normal Storage | 15 acre-ft |
| Surface Area | 5 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 110 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Iowa County |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 10/08/2020 |
| Emergency Action Plan | No |
Identifiers
| NID ID | WI00359 |
| Federal ID | WI00359 |
| More Info | State Dam Safety Program |