Gentry Dam is an earth dam located in Marion County, Missouri, built in 1976. It carries a Low hazard potential classification.
Dam profile
NID height · 26 ft26 ft tall and 2,000 ft long, taller than 55% 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 Gentry Dam
The primary purpose of Gentry Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Malcom Gentry (private). It impounds the Tr-south River near Hannibal.
The dam stands 26 feet tall and stretches 2,000 feet across, creates a reservoir covering 3 acres, has a maximum storage capacity of 130 acre-feet, and collects water from a drainage area of 51 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.
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Location
| State | Missouri |
| County | Marion |
| Nearest City | Hannibal |
| River/Stream | Tr-south River |
| Coordinates | 39.69132, -91.59120 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 25 ft |
| Dam Length | 2,000 ft |
| Year Completed | 1976 (50 years old) |
Storage & Hydraulics
| NID Storage | 130 acre-ft |
| Max Storage | 130 acre-ft |
| Normal Storage | 130 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 51 sq mi |
| Max Discharge | 100 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Malcom Gentry |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO11352 |
| Federal ID | MO11352 |
| More Info | State Dam Safety Program |