Si Energy/mine 25/slurry Cell 2 Dam
Si Energy/mine 25/slurry Cell 2 Dam is an earth dam located in Franklin County, Illinois, built in 1987. It carries a High hazard potential classification.
About Si Energy/mine 25/slurry Cell 2 Dam
Si Energy/mine 25/slurry Cell 2 Dam is a dam in Franklin, Illinois. The dam is owned by S.i. Energy (private). It impounds the Trib Tilley Creek near Thompsonville.
The dam stands 55 feet tall and stretches 7,500 feet across, and has a maximum storage capacity of 3,260 acre-feet. Completed in 1987, the structure is 39 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 10/11/2024.
At 55 feet, this dam is taller than 94% 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 | Franklin |
| Nearest City | Thompsonville |
| River/Stream | Trib Tilley Creek |
| Coordinates | 37.89101, -88.82924 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 55 ft |
| Dam Height | 55 ft |
| Dam Length | 7,500 ft |
| Year Completed | 1987 (39 years old) |
Storage & Hydraulics
| NID Storage | 3,260 acre-ft |
| Max Storage | 3,260 acre-ft |
| Normal Storage | 1,570 acre-ft |
| Max Discharge | 38 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | S.I. ENERGY |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Not Available |
| Last Inspection | 10/11/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL50244 |
| Federal ID | IL50244 |
| More Info | State Dam Safety Program |