Marion County Roadgrade Dam 35-77-21 is an earth dam located in Marion County, Iowa, built in 1971. It carries a Low hazard potential classification.
Dam profile
NID height · 44 ft44 ft tall and 900 ft long, taller than 89% 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 35-77-21
Marion County Roadgrade Dam 35-77-21 is a dam in Marion, Iowa. The dam is owned by Marion County Board of Supervisors (local government). It impounds the North Wildcat Creek near Red Rock Reservoir.
The dam stands 44 feet tall and stretches 900 feet across, creates a reservoir covering 28 acres, has a maximum storage capacity of 672 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1971, 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.
At 44 feet, this dam is taller than 89% of dams nationwide.
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Location
| State | Iowa |
| County | Marion |
| Nearest City | Red Rock Reservoir |
| River/Stream | North Wildcat Creek |
| Coordinates | 41.42390, -93.23350 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 44 ft |
| Dam Height | 44 ft |
| Dam Length | 900 ft |
| Year Completed | 1971 (55 years old) |
Storage & Hydraulics
| NID Storage | 672 acre-ft |
| Max Storage | 672 acre-ft |
| Normal Storage | 226 acre-ft |
| Surface Area | 28 acres |
| Drainage Area | 2 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 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA00650 |
| Federal ID | IA00650 |
| More Info | State Dam Safety Program |