Polk County Roadgrade Dam 3-80-24 is an earth dam located in Polk County, Iowa, built in 1992. It carries a Low hazard potential classification.
Dam profile
NID height · 49 ft49 ft tall and 900 ft long, taller than 92% 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 Polk County Roadgrade Dam 3-80-24
Polk County Roadgrade Dam 3-80-24 is a dam in Polk, Iowa. The dam is owned by Polk County Public Works Dept (local government). It impounds the Tr- Rock Creek near Johnston.
The dam stands 49 feet tall and stretches 900 feet across, creates a reservoir covering 3 acres, has a maximum storage capacity of 51 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1992, the structure is 34 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 49 feet, this dam is taller than 92% of dams nationwide.
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Location
| State | Iowa |
| County | Polk |
| Nearest City | Johnston |
| River/Stream | Tr- Rock Creek |
| Coordinates | 41.69930, -93.65340 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 49 ft |
| Dam Height | 49 ft |
| Dam Length | 900 ft |
| Year Completed | 1992 (34 years old) |
Storage & Hydraulics
| NID Storage | 51 acre-ft |
| Max Storage | 51 acre-ft |
| Normal Storage | 14 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | Polk County Public Works Dept |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA02660 |
| Federal ID | IA02660 |
| More Info | State Dam Safety Program |