Weslake Dam
Weslake Dam is an earth dam located in St. Clair County, Illinois, built in 1962. It carries a Significant hazard potential classification.
About Weslake Dam
The primary purpose of Weslake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Weslake Association (private). It impounds the Tr Negro Hollow,shoenberger Cr near Fairview.
The dam stands 48 feet tall and stretches 330 feet across, creates a reservoir covering 15 acres, has a maximum storage capacity of 340 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1962, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. The most recent inspection on record was 11/01/2024.
At 48 feet, this dam is taller than 92% of dams nationwide.
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Location
| State | Illinois |
| County | St. Clair |
| Nearest City | Fairview |
| River/Stream | Tr Negro Hollow,shoenberger Cr |
| Coordinates | 38.59545, -90.02943 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 48 ft |
| Dam Height | 48 ft |
| Dam Length | 330 ft |
| Year Completed | 1962 (64 years old) |
Storage & Hydraulics
| NID Storage | 340 acre-ft |
| Max Storage | 340 acre-ft |
| Normal Storage | 224 acre-ft |
| Surface Area | 15 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 67 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | WESLAKE ASSOCIATION |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not Available |
| Last Inspection | 11/01/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00367 |
| Federal ID | IL00367 |
| More Info | State Dam Safety Program |