Twelvemile Creek Watershed Site D-41-a2 is an earth dam located in Union County, Iowa, built in 1999. It carries a Low hazard potential classification.
Dam profile
NID height · 38 ft38 ft tall and 544 ft long, taller than 84% 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 Creek Watershed Site D-41-a2
The primary purpose of Twelvemile Creek Watershed Site D-41-a2 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 Twelvemile Creek near Grand River.
The dam stands 38 feet tall and stretches 544 feet across, creates a reservoir covering 13 acres, has a maximum storage capacity of 411 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 38 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 | Iowa |
| County | Union |
| Nearest City | Grand River |
| River/Stream | Twelvemile Creek |
| Coordinates | 40.97060, -94.18940 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 38 ft |
| Dam Height | 38 ft |
| Dam Length | 544 ft |
| Year Completed | 1999 (27 years old) |
Storage & Hydraulics
| NID Storage | 411 acre-ft |
| Max Storage | 411 acre-ft |
| Normal Storage | 102 acre-ft |
| Surface Area | 13 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 | IA03278 |
| Federal ID | IA03278 |
| More Info | State Dam Safety Program |