Waubonsie Cr. Watershed Site 11-1 is an earth dam located in Mills County, Iowa, built in 1977. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 71 ft71 ft tall and 1,050 ft long, taller than 96% 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 Waubonsie Cr. Watershed Site 11-1
The primary purpose of Waubonsie Cr. Watershed Site 11-1 is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Mills County Swcd (local government). It impounds the Tr-waubonsie Creek near Bartlett.
The dam stands 71 feet tall and stretches 1,050 feet across, creates a reservoir covering 73 acres, has a maximum storage capacity of 1,902 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1977, the structure is 49 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 07/29/2020.
At 71 feet, this dam is taller than 96% of all dams in the United States.
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Location
| State | Iowa |
| County | Mills |
| Nearest City | Bartlett |
| River/Stream | Tr-waubonsie Creek |
| Coordinates | 40.92990, -95.74050 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 71 ft |
| Dam Height | 71 ft |
| Dam Length | 1,050 ft |
| Year Completed | 1977 (49 years old) |
Storage & Hydraulics
| NID Storage | 1,902 acre-ft |
| Max Storage | 1,902 acre-ft |
| Normal Storage | 1,404 acre-ft |
| Surface Area | 73 acres |
| Drainage Area | 2 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Mills County Swcd |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 07/29/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA01829 |
| Federal ID | IA01829 |
| More Info | State Dam Safety Program |