Heishman Dam is an earth dam located in Poweshiek County, Iowa, built in 2017. It carries a Low hazard potential classification.
Dam profile
NID height · 40 ft40 ft tall and 340 ft long, taller than 86% 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 Heishman Dam
The primary purpose of Heishman Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Ed Heishman (private). It impounds the Tributary to Walnut Creek near Marengo.
The dam stands 40 feet tall and stretches 340 feet across, creates a reservoir covering 7 acres, has a maximum storage capacity of 112 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 2017, the structure is relatively new.
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 40 feet, this dam is taller than 86% of dams nationwide.
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Location
| State | Iowa |
| County | Poweshiek |
| Nearest City | Marengo |
| River/Stream | Tributary to Walnut Creek |
| Coordinates | 41.79690, -92.54930 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 40 ft |
| Dam Height | 40 ft |
| Dam Length | 340 ft |
| Year Completed | 2017 (9 years old) |
Storage & Hydraulics
| NID Storage | 112 acre-ft |
| Max Storage | 112 acre-ft |
| Normal Storage | 64 acre-ft |
| Surface Area | 7 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Recreation |
| Owner | Ed Heishman |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA04263 |
| Federal ID | IA04263 |
| More Info | State Dam Safety Program |