Wallace Dam is an earth dam located in Greene County, Iowa, built in 2024. It carries a Low hazard potential classification.
Dam profile
NID height · 8 ft8 ft tall and 711 ft long. 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 Wallace Dam
The primary purpose of Wallace Dam 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 Chris Wallace (private). It impounds the Unnamed Trib near Jefferson.
The dam stands 8 feet tall and stretches 711 feet across, creates a reservoir covering 12 acres, has a maximum storage capacity of 92 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 2024, 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.
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Location
| State | Iowa |
| County | Greene |
| Nearest City | Jefferson |
| River/Stream | Unnamed Trib |
| Coordinates | 42.12480, -94.55170 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 8 ft |
| Dam Height | 8 ft |
| Dam Length | 711 ft |
| Year Completed | 2024 (2 years old) |
Storage & Hydraulics
| NID Storage | 92 acre-ft |
| Max Storage | 92 acre-ft |
| Normal Storage | 23 acre-ft |
| Surface Area | 12 acres |
| Drainage Area | 3 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Chris Wallace |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA04406 |
| Federal ID | IA04406 |
| More Info | State Dam Safety Program |