Johnston City Sewage Lagoon Dam
Johnston City Sewage Lagoon Dam is an earth dam located in Williamson County, Illinois, built in 1963. It carries a Significant hazard potential classification.
About Johnston City Sewage Lagoon Dam
Johnston City Sewage Lagoon Dam is a dam in Williamson, Illinois. The dam is owned by City Of Johnston City (local government). It impounds the Lake Creek near Johnston City.
The dam stands 12 feet tall and stretches 1,600 feet across, and has a maximum storage capacity of 165 acre-feet. Completed in 1963, 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 08/30/2018.
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Location
| State | Illinois |
| County | Williamson |
| Nearest City | Johnston City |
| River/Stream | Lake Creek |
| Coordinates | 37.80791, -88.93069 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Dam Length | 1,600 ft |
| Year Completed | 1963 (63 years old) |
Storage & Hydraulics
| NID Storage | 165 acre-ft |
| Max Storage | 165 acre-ft |
| Normal Storage | 75 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | CITY OF JOHNSTON CITY |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Not Available |
| Last Inspection | 08/30/2018 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00103 |
| Federal ID | IL00103 |
| More Info | State Dam Safety Program |