Twelvemile Watershed Site D-60 is an earth dam located in Union County, Iowa, built in 1999. It carries a Low hazard potential classification.
Dam profile
NID height · 35 ft35 ft tall and 611 ft long, taller than 80% 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 Twelvemile Watershed Site D-60
The primary purpose of Twelvemile Watershed Site D-60 is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by Union County Swcd (local government). It impounds the Tr- Twelvemile Creek near Afton.
The dam stands 35 feet tall and stretches 611 feet across, creates a reservoir covering 14 acres, has a maximum storage capacity of 497 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1999, the structure is 27 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.
At 35 feet, this dam is taller than 80% of dams nationwide.
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Location
| State | Iowa |
| County | Union |
| Nearest City | Afton |
| River/Stream | Tr- Twelvemile Creek |
| Coordinates | 41.03350, -94.24110 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 35 ft |
| Dam Height | 35 ft |
| Dam Length | 611 ft |
| Year Completed | 1999 (27 years old) |
Storage & Hydraulics
| NID Storage | 497 acre-ft |
| Max Storage | 497 acre-ft |
| Normal Storage | 98 acre-ft |
| Surface Area | 14 acres |
| Drainage Area | 1 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Union County Swcd |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA03277 |
| Federal ID | IA03277 |
| More Info | State Dam Safety Program |