Ryan Henschal Watershed Site A-2 is an earth dam located in Pottawattamie County, Iowa, built in 1976. It carries a Low hazard potential classification.
Dam profile
NID height · 39 ft39 ft tall and 1,000 ft long, taller than 85% 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 Ryan Henschal Watershed Site A-2
The primary purpose of Ryan Henschal Watershed Site A-2 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 West Pottawattamie County Swcd (local government). It impounds the Little Henschal Creek near Council Bluffs.
The dam stands 39 feet tall and stretches 1,000 feet across, creates a reservoir covering 19 acres, has a maximum storage capacity of 391 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1976, the structure is 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. The most recent inspection on record was 09/25/2003. That was over 23 years ago.
At 39 feet, this dam is taller than 85% of dams nationwide.
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Location
| State | Iowa |
| County | Pottawattamie |
| Nearest City | Council Bluffs |
| River/Stream | Little Henschal Creek |
| Coordinates | 41.34740, -95.75230 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 39 ft |
| Dam Height | 39 ft |
| Dam Length | 1,000 ft |
| Year Completed | 1976 (50 years old) |
Storage & Hydraulics
| NID Storage | 391 acre-ft |
| Max Storage | 391 acre-ft |
| Normal Storage | 143 acre-ft |
| Surface Area | 19 acres |
| Drainage Area | 1 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | West Pottawattamie County Swcd |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 09/25/2003 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA01867 |
| Federal ID | IA01867 |
| More Info | State Dam Safety Program |