Autumn Lake Dam
Autumn Lake Dam is an earth dam located in Jefferson County, Missouri, built in 1981. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Autumn Lake Dam
The primary purpose of Autumn Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Raintree Plantation Poa (private). It impounds the Belew Creek near Hillsboro.
The dam stands 72 feet tall and stretches 1,350 feet across, creates a reservoir covering 124 acres, has a maximum storage capacity of 2,820 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1981, the structure is 45 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 02/15/2023.
At 72 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 | Jefferson |
| Nearest City | Hillsboro |
| River/Stream | Belew Creek |
| Coordinates | 38.26511, -90.60183 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 72 ft |
| Dam Height | 72 ft |
| Dam Length | 1,350 ft |
| Year Completed | 1981 (45 years old) |
Storage & Hydraulics
| NID Storage | 2,820 acre-ft |
| Max Storage | 2,820 acre-ft |
| Normal Storage | 2,820 acre-ft |
| Surface Area | 124 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 1,600 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | RAINTREE PLANTATION POA |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 02/15/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MO31828 |
| Federal ID | MO31828 |
| More Info | State Dam Safety Program |