Twelve Mile Creek Watershed Site D-41-a-5 is an earth dam located in Union County, Iowa, built in 2006. It carries a Low hazard potential classification.
Dam profile
NID height · 36 ft36 ft tall and 464 ft long, taller than 82% 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 Twelve Mile Creek Watershed Site D-41-a-5
The primary purpose of Twelve Mile Creek Watershed Site D-41-a-5 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 Union County Swcd (local government). It impounds the Tr- Twelve Mile Creek near Grand River.
The dam stands 36 feet tall and stretches 464 feet across, creates a reservoir covering 6 acres, has a maximum storage capacity of 168 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 2006, the structure is relatively new.
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.
At 36 feet, this dam is taller than 82% of dams nationwide.
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Location
| State | Iowa |
| County | Union |
| Nearest City | Grand River |
| River/Stream | Tr- Twelve Mile Creek |
| Coordinates | 40.97170, -94.17860 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 36 ft |
| Dam Height | 36 ft |
| Dam Length | 464 ft |
| Year Completed | 2006 (20 years old) |
Storage & Hydraulics
| NID Storage | 168 acre-ft |
| Max Storage | 168 acre-ft |
| Normal Storage | 38 acre-ft |
| Surface Area | 6 acres |
| Drainage Area | 1 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Union County Swcd |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA03819 |
| Federal ID | IA03819 |
| More Info | State Dam Safety Program |