Little Cache Structure 8 Dam
Little Cache Structure 8 Dam is an earth dam located in Johnson County, Illinois, built in 1970. It carries a Significant hazard potential classification.
About Little Cache Structure 8 Dam
The primary purpose of Little Cache Structure 8 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 Vienna Drainage District (local government). It impounds the Trib Little Cache Creek near Vienna.
The dam stands 21 feet tall and stretches 820 feet across, and has a maximum storage capacity of 242 acre-feet. Completed in 1970, 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 07/26/2024.
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Location
| State | Illinois |
| County | Johnson |
| Nearest City | Vienna |
| River/Stream | Trib Little Cache Creek |
| Coordinates | 37.46553, -88.86081 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 21 ft |
| Dam Height | 21 ft |
| Dam Length | 820 ft |
| Year Completed | 1970 (56 years old) |
Storage & Hydraulics
| NID Storage | 242 acre-ft |
| Max Storage | 242 acre-ft |
| Normal Storage | 56 acre-ft |
| Max Discharge | 1,692 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | VIENNA DRAINAGE DISTRICT |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Not Available |
| Last Inspection | 07/26/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00042 |
| Federal ID | IL00042 |
| More Info | State Dam Safety Program |