Madison County Roadgrade Dam 4-74-29 is an earth dam located in Madison County, Iowa, built in 1987. It carries a Low hazard potential classification.
Dam profile
NID height · 33 ft33 ft tall and 400 ft long, taller than 76% 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 Madison County Roadgrade Dam 4-74-29
Madison County Roadgrade Dam 4-74-29 is a dam in Madison, Iowa. The dam is owned by Madison County (local government). It impounds the Tr- Rocky Branch near Pammel State Park.
The dam stands 33 feet tall and stretches 400 feet across, creates a reservoir covering 5 acres, has a maximum storage capacity of 143 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1987, the structure is 39 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 33 feet, this dam is taller than 76% of dams nationwide.
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Location
| State | Iowa |
| County | Madison |
| Nearest City | Pammel State Park |
| River/Stream | Tr- Rocky Branch |
| Coordinates | 41.24080, -94.18510 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 33 ft |
| Dam Height | 33 ft |
| Dam Length | 400 ft |
| Year Completed | 1987 (39 years old) |
Storage & Hydraulics
| NID Storage | 143 acre-ft |
| Max Storage | 143 acre-ft |
| Normal Storage | 31 acre-ft |
| Surface Area | 5 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | Madison County |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA02572 |
| Federal ID | IA02572 |
| More Info | State Dam Safety Program |