Crown 3 Mine North Refuse Extension Dam is an earth dam located in Montgomery County, Illinois, built in 2000. It carries a High hazard potential classification.
Dam profile
NID height · 35 ft35 ft tall and 3,800 ft long, taller than 80% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Crown 3 Mine North Refuse Extension Dam
Crown 3 Mine North Refuse Extension Dam is a dam in Montgomery, Illinois. The dam is owned by J Oros Properties, LLC (private). It impounds the Perched Reservoir near Farmersville.
The dam stands 35 feet tall and stretches 3,800 feet across, creates a reservoir covering 35 acres, has a maximum storage capacity of 730 acre-feet, and collects water from a drainage area of 35 square miles. Completed in 2000, the structure is 26 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 08/08/2025.
At 35 feet, this dam is taller than 80% 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 | Montgomery |
| Nearest City | Farmersville |
| River/Stream | Perched Reservoir |
| Coordinates | 39.43738, -89.69667 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 35 ft |
| Dam Height | 35 ft |
| Dam Length | 3,800 ft |
| Year Completed | 2000 (26 years old) |
Storage & Hydraulics
| NID Storage | 730 acre-ft |
| Max Storage | 730 acre-ft |
| Normal Storage | 600 acre-ft |
| Surface Area | 35 acres |
| Drainage Area | 35 sq mi |
| Max Discharge | 8 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | J Oros Properties, LLC |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Not assessed |
| Last Inspection | 08/08/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL50461 |
| Federal ID | IL50461 |
| More Info | State Dam Safety Program |