Johnson Lake Dam is an earth dam located in Carroll County, Missouri, built in 1955. It carries a High 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 Lake Dam
The primary purpose of Johnson Lake Dam is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by E.c. Johnson Corp. (private). It impounds the Offstream Standley Branch near Carrolton.
The dam stands 25 feet tall, creates a reservoir covering 7 acres, has a maximum storage capacity of 94 acre-feet, and collects water from a drainage area of 32 square miles. Completed in 1955, the structure is well into its service life at over 50 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. The most recent inspection on record was 07/01/1980. That was 46 years ago — unusually long for a high-hazard dam, which typically requires more frequent inspections.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Missouri dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Missouri |
| County | Carroll |
| Nearest City | Carrolton |
| River/Stream | Offstream Standley Branch |
| Coordinates | 39.37603, -93.48860 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Year Completed | 1955 (71 years old) |
Storage & Hydraulics
| NID Storage | 94 acre-ft |
| Max Storage | 94 acre-ft |
| Normal Storage | 54 acre-ft |
| Surface Area | 7 acres |
| Drainage Area | 32 sq mi |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | E.c. Johnson Corp. |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Not assessed |
| Last Inspection | 07/01/1980 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO10650 |
| Federal ID | MO10650 |
| More Info | State Dam Safety Program |