Johnson-6 Dam is an earth dam located in Putnam County, Missouri, built in 1985. It carries a Low hazard potential classification.
Dam profile
NID height · 21 ft21 ft tall and 350 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 Johnson-6 Dam
The primary purpose of Johnson-6 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 Tim Hodges (private). It impounds the Chariton River near Martinstown.
The dam stands 21 feet tall and stretches 350 feet across, creates a reservoir covering 5 acres, has a maximum storage capacity of 53 acre-feet, and collects water from a drainage area of 235 square miles. Completed in 1985, the structure is 41 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 | Putnam |
| Nearest City | Martinstown |
| River/Stream | Chariton River |
| Coordinates | 40.54284, -92.99949 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 21 ft |
| Dam Height | 20 ft |
| Dam Length | 350 ft |
| Year Completed | 1985 (41 years old) |
Storage & Hydraulics
| NID Storage | 53 acre-ft |
| Max Storage | 53 acre-ft |
| Normal Storage | 53 acre-ft |
| Surface Area | 5 acres |
| Drainage Area | 235 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Tim Hodges |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO12362 |
| Federal ID | MO12362 |
| More Info | State Dam Safety Program |