Kinmundy New Lake Dam
Kinmundy New Lake Dam is an earth dam located in Marion County, Illinois, built in 1998. It carries a High hazard potential classification.
About Kinmundy New Lake Dam
The primary purpose of Kinmundy New Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by City Of Kinmundy (private). It impounds the Trib East Fork Kaskaskia River.
The dam stands 38 feet tall and stretches 1,250 feet across, creates a reservoir covering 100 acres, has a maximum storage capacity of 2,250 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1998, the structure is 28 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. An emergency action plan is in place for this dam. The most recent inspection on record was 09/15/2025.
At 38 feet, this dam is taller than 85% 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 Illinois 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 | Illinois |
| County | Marion |
| River/Stream | Trib East Fork Kaskaskia River |
| Coordinates | 38.77365, -88.87493 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 38 ft |
| Dam Height | 38 ft |
| Dam Length | 1,250 ft |
| Year Completed | 1998 (28 years old) |
Storage & Hydraulics
| NID Storage | 2,250 acre-ft |
| Max Storage | 2,250 acre-ft |
| Normal Storage | 1,192 acre-ft |
| Surface Area | 100 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 11,750 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | CITY OF KINMUNDY |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Not Available |
| Last Inspection | 09/15/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL50271 |
| Federal ID | IL50271 |
| More Info | State Dam Safety Program |