Lone Jack Lake Dam is an earth dam located in Jackson County, Missouri, built in 1990. It carries a High hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 47 ft47 ft tall and 925 ft long, taller than 91% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Lone Jack Lake Dam
The primary purpose of Lone Jack Lake 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 Mo Dept of Conservation (state). It impounds the Trib to the Sni-a-bar near Lonejack.
The dam stands 47 feet tall and stretches 925 feet across, creates a reservoir covering 35 acres, has a maximum storage capacity of 660 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1990, the structure is 36 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. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 12/02/2020.
At 47 feet, this dam is taller than 91% of dams nationwide.
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 | Jackson |
| Nearest City | Lonejack |
| River/Stream | Trib to the Sni-a-bar |
| Coordinates | 38.89449, -94.19253 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 47 ft |
| Dam Height | 47 ft |
| Dam Length | 925 ft |
| Year Completed | 1990 (36 years old) |
Storage & Hydraulics
| NID Storage | 660 acre-ft |
| Max Storage | 660 acre-ft |
| Normal Storage | 411 acre-ft |
| Surface Area | 35 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Mo Dept of Conservation |
| Owner Type | State |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 12/02/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MO20768 |
| Federal ID | MO20768 |
| More Info | State Dam Safety Program |