Blockton Watershed Site S-5 is an earth dam located in Taylor County, Iowa, built in 1993. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 41 ft41 ft tall and 1,170 ft long, taller than 87% 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 Blockton Watershed Site S-5
The primary purpose of Blockton Watershed Site S-5 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 Taylor County Swcd (local government). It impounds the Tr-platte River near Blockton.
The dam stands 41 feet tall and stretches 1,170 feet across, creates a reservoir covering 70 acres, has a maximum storage capacity of 3,021 acre-feet, and collects water from a drainage area of 6 square miles. Completed in 1993, the structure is 33 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 08/30/2021.
At 41 feet, this dam is taller than 87% of dams nationwide.
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Location
| State | Iowa |
| County | Taylor |
| Nearest City | Blockton |
| River/Stream | Tr-platte River |
| Coordinates | 40.62670, -94.49670 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 41 ft |
| Dam Height | 41 ft |
| Dam Length | 1,170 ft |
| Year Completed | 1993 (33 years old) |
Storage & Hydraulics
| NID Storage | 3,021 acre-ft |
| Max Storage | 3,021 acre-ft |
| Normal Storage | 435 acre-ft |
| Surface Area | 70 acres |
| Drainage Area | 6 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Taylor County Swcd |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/30/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA02665 |
| Federal ID | IA02665 |
| More Info | State Dam Safety Program |