Herrin Reservoir 1 Dam
Herrin Reservoir 1 Dam is an earth dam located in Williamson County, Illinois, built in 1915. It carries a Significant hazard potential classification.
About Herrin Reservoir 1 Dam
The primary purpose of Herrin Reservoir 1 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 Herrin (local government). It impounds the Trib Hurricane near Colp.
The dam stands 6 feet tall and stretches 489 feet across, and has a maximum storage capacity of 271 acre-feet. Completed in 1915, the structure is over a century 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 10/31/2023.
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Location
| State | Illinois |
| County | Williamson |
| Nearest City | Colp |
| River/Stream | Trib Hurricane |
| Coordinates | 37.76371, -89.03601 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 6 ft |
| Dam Height | 6 ft |
| Dam Length | 489 ft |
| Year Completed | 1915 (111 years old) |
Storage & Hydraulics
| NID Storage | 271 acre-ft |
| Max Storage | 271 acre-ft |
| Normal Storage | 50 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | CITY OF HERRIN |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Not Available |
| Last Inspection | 10/31/2023 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00050 |
| Federal ID | IL00050 |
| More Info | State Dam Safety Program |