Johnson Dam is an earth dam located in Chariton County, Missouri, built in 2005. It carries a Low hazard potential classification.
Dam profile
NID height · 33 ft33 ft tall and 482 ft long, taller than 76% 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 Johnson Dam
The primary purpose of Johnson Dam is grade stabilization. Grade stabilization dams prevent erosion by reducing the slope and velocity of water flowing through a channel. They're commonly used to stop gullies from deepening and to protect downstream land and infrastructure. The dam is owned by Charles Johnson (private). It impounds the Tr-cottonwood near Keytesville.
The dam stands 33 feet tall and stretches 482 feet across, creates a reservoir covering 6 acres, has a maximum storage capacity of 25 acre-feet, and collects water from a drainage area of 330 square miles. Completed in 2005, 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. The most recent inspection on record was 10/01/2005. That was over 21 years ago.
At 33 feet, this dam is taller than 76% of dams nationwide.
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Location
| State | Missouri |
| County | Chariton |
| Nearest City | Keytesville |
| River/Stream | Tr-cottonwood |
| Coordinates | 39.54710, -92.88070 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 33 ft |
| Dam Height | 29 ft |
| Dam Length | 482 ft |
| Year Completed | 2005 (21 years old) |
Storage & Hydraulics
| NID Storage | 25 acre-ft |
| Max Storage | 25 acre-ft |
| Normal Storage | 20 acre-ft |
| Surface Area | 6 acres |
| Drainage Area | 330 sq mi |
| Max Discharge | 11 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Grade Stabilization |
| Owner | Charles Johnson |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 10/01/2005 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO51397 |
| Federal ID | MO51397 |
| More Info | State Dam Safety Program |