Bay Creek Structure 4 Dam is an earth dam located in Johnson County, Illinois, built in 1977. It carries a Low hazard potential classification.
Dam profile
NID height · 36 ft36 ft tall and 845 ft long, taller than 82% 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 Bay Creek Structure 4 Dam
The primary purpose of Bay Creek Structure 4 Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Larry, Joe and Glenn Trovillion (private). It impounds the Trib Johnson Creek near Reevesville.
The dam stands 36 feet tall and stretches 845 feet across, and has a maximum storage capacity of 366 acre-feet. Completed in 1977, the structure is 49 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. The most recent inspection on record was 07/26/2024.
At 36 feet, this dam is taller than 82% of dams nationwide.
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Location
| State | Illinois |
| County | Johnson |
| Nearest City | Reevesville |
| River/Stream | Trib Johnson Creek |
| Coordinates | 37.38365, -88.78582 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 36 ft |
| Dam Height | 36 ft |
| Dam Length | 845 ft |
| Year Completed | 1977 (49 years old) |
Storage & Hydraulics
| NID Storage | 366 acre-ft |
| Max Storage | 366 acre-ft |
| Normal Storage | 48 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Larry, Joe and Glenn Trovillion |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 07/26/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00955 |
| Federal ID | IL00955 |
| More Info | State Dam Safety Program |