Herrin Reservoir 2 Dam is an earth dam located in Williamson County, Illinois, built in 1926. It carries a Significant hazard potential classification.
Dam profile
NID height · 27 ft27 ft tall and 630 ft long, taller than 59% 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 Herrin Reservoir 2 Dam
The primary purpose of Herrin Reservoir 2 Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Herrin Water Company (public utility). It impounds the Middle Wolf Creek near Carbondale.
The dam stands 27 feet tall and stretches 630 feet across, and has a maximum storage capacity of 659 acre-feet. Completed in 1926, the structure is well-established, with more than 75 years of service.
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 | Carbondale |
| River/Stream | Middle Wolf Creek |
| Coordinates | 37.63633, -89.01374 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 27 ft |
| Dam Height | 27 ft |
| Dam Length | 630 ft |
| Year Completed | 1926 (100 years old) |
Storage & Hydraulics
| NID Storage | 659 acre-ft |
| Max Storage | 659 acre-ft |
| Normal Storage | 411 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Herrin Water Company |
| Owner Type | Public Utility |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 10/31/2023 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00049 |
| Federal ID | IL00049 |
| More Info | State Dam Safety Program |