Johnson Dam is an earth dam located in Clay County, Missouri, built in 1975. It carries a Low hazard potential classification.
Dam profile
NID height · 25 ft25 ft tall, taller than 50% 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 recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Howard Johnson (private). It impounds the Tr to Owens Branch near Smithville.
The dam stands 25 feet tall, creates a reservoir covering 14 acres, has a maximum storage capacity of 187 acre-feet, and collects water from a drainage area of 85 square miles. Completed in 1975, the structure is well into its service life at over 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 | Clay |
| Nearest City | Smithville |
| River/Stream | Tr to Owens Branch |
| Coordinates | 39.43423, -94.58631 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Year Completed | 1975 (51 years old) |
Storage & Hydraulics
| NID Storage | 187 acre-ft |
| Max Storage | 187 acre-ft |
| Normal Storage | 93 acre-ft |
| Surface Area | 14 acres |
| Drainage Area | 85 sq mi |
Ownership & Safety
| Purpose | Recreation |
| Owner | Howard Johnson |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO11831 |
| Federal ID | MO11831 |
| More Info | State Dam Safety Program |