Union County Roadgrade Dam 29-73-29 is an earth dam located in Union County, Iowa, built in 1993. It carries a Low hazard potential classification.
Dam profile
NID height · 39 ft39 ft tall and 435 ft long, taller than 85% 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 Union County Roadgrade Dam 29-73-29
Union County Roadgrade Dam 29-73-29 is a dam in Union, Iowa. The dam is owned by Union County Board of Supervisors (local government). It impounds the Tr- Three Mile Creek near Afton.
The dam stands 39 feet tall and stretches 435 feet across, creates a reservoir covering 2 acres, has a maximum storage capacity of 59 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1993, the structure is 33 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 39 feet, this dam is taller than 85% of dams nationwide.
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Location
| State | Iowa |
| County | Union |
| Nearest City | Afton |
| River/Stream | Tr- Three Mile Creek |
| Coordinates | 41.09090, -94.22070 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 39 ft |
| Dam Height | 39 ft |
| Dam Length | 435 ft |
| Year Completed | 1993 (33 years old) |
Storage & Hydraulics
| NID Storage | 59 acre-ft |
| Max Storage | 59 acre-ft |
| Normal Storage | 16 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | Union County Board of Supervisors |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA02666 |
| Federal ID | IA02666 |
| More Info | State Dam Safety Program |