Isley Lake Dam
Isley Lake Dam is an earth dam located in Warren County, Missouri, built in 1984. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Isley Lake Dam
The primary purpose of Isley 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 Unnamed Trib To Dry Fork near Warrenton.
The dam stands 65 feet tall and stretches 400 feet across, creates a reservoir covering 8 acres, has a maximum storage capacity of 349 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1984, the structure is 42 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 05/12/2022.
At 65 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 | Warren |
| Nearest City | Warrenton |
| River/Stream | Unnamed Trib To Dry Fork |
| Coordinates | 38.77874, -91.16234 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 65 ft |
| Dam Height | 65 ft |
| Dam Length | 400 ft |
| Year Completed | 1984 (42 years old) |
Storage & Hydraulics
| NID Storage | 349 acre-ft |
| Max Storage | 349 acre-ft |
| Normal Storage | 268 acre-ft |
| Surface Area | 8 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 524 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/12/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MO31848 |
| Federal ID | MO31848 |
| More Info | State Dam Safety Program |