Butterfly Lake Dam
Butterfly Lake Dam is an other dam located in Ste. Genevieve County, Missouri, built in 1973. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Butterfly Lake Dam
The primary purpose of Butterfly Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is private-owned. It impounds the River Aux Vases near River Aux Vases.
The dam stands 68 feet tall and stretches 600 feet across, creates a reservoir covering 65 acres, has a maximum storage capacity of 1,768 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1973, 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. 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 09/22/2022.
At 68 feet, this dam is taller than 96% of all dams in the United States.
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 | River Aux Vases |
| River/Stream | River Aux Vases |
| Coordinates | 37.78781, -90.24726 |
Physical Characteristics
| Dam Type | Other |
| NID Height | 68 ft |
| Dam Height | 68 ft |
| Dam Length | 600 ft |
| Year Completed | 1973 (53 years old) |
Storage & Hydraulics
| NID Storage | 1,768 acre-ft |
| Max Storage | 1,768 acre-ft |
| Normal Storage | 1,091 acre-ft |
| Surface Area | 65 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 22,465 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/22/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MO30501 |
| Federal ID | MO30501 |
| More Info | State Dam Safety Program |