St. Clair County Retention Pond 1 Dam
St. Clair County Retention Pond 1 Dam is an earth dam located in St. Clair County, Illinois, built in 1999. It carries a High hazard potential classification.
About St. Clair County Retention Pond 1 Dam
The primary purpose of St. Clair County Retention Pond 1 Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by St. Clair County (private). It impounds the Wolf Branch Creek near Belleville.
The dam stands 31 feet tall and stretches 500 feet across, and has a maximum storage capacity of 191 acre-feet. Completed in 1999, the structure is 27 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 06/13/2023.
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 | St. Clair |
| Nearest City | Belleville |
| River/Stream | Wolf Branch Creek |
| Coordinates | 38.54564, -89.98292 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 31 ft |
| Dam Height | 31 ft |
| Dam Length | 500 ft |
| Year Completed | 1999 (27 years old) |
Storage & Hydraulics
| NID Storage | 191 acre-ft |
| Max Storage | 191 acre-ft |
| Normal Storage | 43 acre-ft |
| Max Discharge | 1,660 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | ST. CLAIR COUNTY |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Not Available |
| Last Inspection | 06/13/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL50263 |
| Federal ID | IL50263 |
| More Info | State Dam Safety Program |