Marion County Roadgrade Dam is an earth dam located in Marion County, Iowa, built in 1965. It carries a Low hazard potential classification.
Dam profile
NID height · 37 ft37 ft tall and 700 ft long, taller than 83% 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 Marion County Roadgrade Dam
Marion County Roadgrade Dam is a dam in Marion, Iowa. The dam is owned by Marion County Board of Supervisors (local government). It impounds the Tr-des Moines River near Harvey.
The dam stands 37 feet tall and stretches 700 feet across, creates a reservoir covering 4 acres, has a maximum storage capacity of 87 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1965, the structure is well into its service life at over 50 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. The most recent inspection on record was 12/17/1964. That was over 61 years ago.
At 37 feet, this dam is taller than 83% of dams nationwide.
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Location
| State | Iowa |
| County | Marion |
| Nearest City | Harvey |
| River/Stream | Tr-des Moines River |
| Coordinates | 41.39770, -92.95300 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 37 ft |
| Dam Height | 37 ft |
| Dam Length | 700 ft |
| Year Completed | 1965 (61 years old) |
Storage & Hydraulics
| NID Storage | 87 acre-ft |
| Max Storage | 87 acre-ft |
| Normal Storage | 55 acre-ft |
| Surface Area | 4 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | Marion County Board of Supervisors |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 12/17/1964 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA00661 |
| Federal ID | IA00661 |
| More Info | State Dam Safety Program |