Joliet West Side Wastewater Treatment Plant Dam
Joliet West Side Wastewater Treatment Plant Dam is an earth dam located in Will County, Illinois. It carries a Low hazard potential classification.
About Joliet West Side Wastewater Treatment Plant Dam
The primary purpose of Joliet West Side Wastewater Treatment Plant 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 City Of Joliet (local government). It impounds the Des Plaines River - Offstream near Joliet.
The dam stands 25 feet tall and stretches 1,000 feet across, creates a reservoir covering 5 acres, has a maximum storage capacity of 77 acre-feet, and collects water from a drainage area of 0 square miles.
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 06/03/2025.
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Location
| State | Illinois |
| County | Will |
| Nearest City | Joliet |
| River/Stream | Des Plaines River - Offstream |
| Coordinates | 41.45744, -88.18431 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 1,000 ft |
Storage & Hydraulics
| NID Storage | 77 acre-ft |
| Max Storage | 77 acre-ft |
| Surface Area | 5 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | None |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | CITY OF JOLIET |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not Available |
| Last Inspection | 06/03/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL55049 |
| Federal ID | IL55049 |
| More Info | State Dam Safety Program |