Gill Lake Dam is an earth dam located in Schuyler County, Illinois, built in 1974. It carries a Significant hazard potential classification.
Dam profile
NID height · 30 ft30 ft tall and 290 ft long, taller than 68% 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 Gill Lake Dam
The primary purpose of Gill Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Al Estock (private). It impounds the Trib South Branch Sugar Creek near Ray.
The dam stands 30 feet tall and stretches 290 feet across, and has a maximum storage capacity of 38 acre-feet. Completed in 1974, 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 05/20/2024.
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Location
| State | Illinois |
| County | Schuyler |
| Nearest City | Ray |
| River/Stream | Trib South Branch Sugar Creek |
| Coordinates | 40.18692, -90.50248 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 290 ft |
| Year Completed | 1974 (52 years old) |
Storage & Hydraulics
| NID Storage | 38 acre-ft |
| Max Storage | 38 acre-ft |
| Normal Storage | 22 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Al Estock |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 05/20/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00809 |
| Federal ID | IL00809 |
| More Info | State Dam Safety Program |