Marion County Roadgrade Dam 25-76-19 is an earth dam located in Marion County, Iowa, built in 1964. It carries a Low hazard potential classification.
Dam profile
NID height · 47 ft47 ft tall and 1,300 ft long, taller than 91% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Marion County Roadgrade Dam 25-76-19
Marion County Roadgrade Dam 25-76-19 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 Red Rock Reservoir.
The dam stands 47 feet tall and stretches 1,300 feet across, creates a reservoir covering 5 acres, has a maximum storage capacity of 562 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1964, 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 09/25/1963. That was over 63 years ago.
At 47 feet, this dam is taller than 91% of dams nationwide.
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Location
| State | Iowa |
| County | Marion |
| Nearest City | Red Rock Reservoir |
| River/Stream | Tr-des Moines River |
| Coordinates | 41.35690, -92.98830 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 47 ft |
| Dam Height | 47 ft |
| Dam Length | 1,300 ft |
| Year Completed | 1964 (62 years old) |
Storage & Hydraulics
| NID Storage | 562 acre-ft |
| Max Storage | 562 acre-ft |
| Normal Storage | 42 acre-ft |
| Surface Area | 5 acres |
| Drainage Area | 1 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 | 09/25/1963 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA00660 |
| Federal ID | IA00660 |
| More Info | State Dam Safety Program |