Shelby County Roadgrade Dam 1-81-40
Shelby County Roadgrade Dam 1-81-40 is an earth dam located in Shelby County, Iowa, built in 1958. It carries a Low hazard potential classification.
About Shelby County Roadgrade Dam 1-81-40
Shelby County Roadgrade Dam 1-81-40 is a dam in Shelby, Iowa. The dam is owned by Shelby County Board Of Supervisors (local government). It impounds the Tr-mill Creek near Manteno.
The dam stands 26 feet tall and stretches 1,300 feet across, creates a reservoir covering 21 acres, has a maximum storage capacity of 539 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1958, 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.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Iowa |
| County | Shelby |
| Nearest City | Manteno |
| River/Stream | Tr-mill Creek |
| Coordinates | 41.85730, -95.45970 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 26 ft |
| Dam Length | 1,300 ft |
| Year Completed | 1958 (68 years old) |
Storage & Hydraulics
| NID Storage | 539 acre-ft |
| Max Storage | 539 acre-ft |
| Normal Storage | 250 acre-ft |
| Surface Area | 21 acres |
| Drainage Area | 2 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | Shelby County Board of Supervisors |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA00990 |
| Federal ID | IA00990 |
| More Info | State Dam Safety Program |