Lake Genevieve Lower Dam
Lake Genevieve Lower Dam is an earth dam located in Ste. Genevieve County, Missouri, built in 1957. It carries a High hazard potential classification.
About Lake Genevieve Lower Dam
The primary purpose of Lake Genevieve Lower Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Rush Smith (private). It impounds the Tr-south Fork Jonca Creek near St Marys.
The dam stands 20 feet tall, creates a reservoir covering 13 acres, has a maximum storage capacity of 139 acre-feet, and collects water from a drainage area of 590 square miles. Completed in 1957, 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.
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 | Ste. Genevieve |
| Nearest City | St Marys |
| River/Stream | Tr-south Fork Jonca Creek |
| Coordinates | 37.82574, -90.31488 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Year Completed | 1957 (69 years old) |
Storage & Hydraulics
| NID Storage | 139 acre-ft |
| Max Storage | 139 acre-ft |
| Normal Storage | 69 acre-ft |
| Surface Area | 13 acres |
| Drainage Area | 590 sq mi |
Ownership & Safety
| Purpose | Recreation |
| Owner | RUSH SMITH |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Not Rated |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO30503 |
| Federal ID | MO30503 |
| More Info | State Dam Safety Program |