Twin Parks 12
Twin Parks 12 is an earth dam located in Iowa County, Wisconsin, built in 1968. It carries a Low hazard potential classification and has a fair condition assessment.
About Twin Parks 12
The primary purpose of Twin Parks 12 is debris control. The dam is designed to catch sediment, rocks, and debris carried by flowing water — particularly important in areas prone to mudslides or heavy erosion. The dam is owned by Iowa County (local government). It impounds the Mill Creek.
The dam stands 37 feet tall and stretches 500 feet across, has a maximum storage capacity of 1,450 acre-feet, and collects water from a drainage area of 8 square miles. Completed in 1968, 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 04/26/2013. That was over 12 years ago.
At 37 feet, this dam is taller than 84% of dams nationwide.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Wisconsin |
| County | Iowa |
| Nearest City | None |
| River/Stream | Mill Creek |
| Coordinates | 43.01305, -90.04224 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 37 ft |
| Dam Height | 37 ft |
| Dam Length | 500 ft |
| Year Completed | 1968 (58 years old) |
Storage & Hydraulics
| NID Storage | 1,450 acre-ft |
| Max Storage | 1,450 acre-ft |
| Drainage Area | 8 sq mi |
| Max Discharge | 620 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Debris Control |
| Owner | Iowa County |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 04/26/2013 |
| Emergency Action Plan | No |
Identifiers
| NID ID | WI00364 |
| Federal ID | WI00364 |
| More Info | State Dam Safety Program |