Joliet Junior College Lake Dam is an earth dam located in Will County, Illinois, built in 1980. It carries a Significant hazard potential classification.
Dam profile
NID height · 11 ft11 ft tall and 345 ft long. 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 Joliet Junior College Lake Dam
The primary purpose of Joliet Junior College Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Joliet Junior College (local government). It impounds the Trib Rock Run Creek near Joliet.
The dam stands 11 feet tall and stretches 345 feet across, creates a reservoir covering 8 acres, has a maximum storage capacity of 59 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1980, the structure is 46 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 04/07/2023.
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Location
| State | Illinois |
| County | Will |
| Nearest City | Joliet |
| River/Stream | Trib Rock Run Creek |
| Coordinates | 41.50116, -88.18554 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 11 ft |
| Dam Height | 11 ft |
| Dam Length | 345 ft |
| Year Completed | 1980 (46 years old) |
Storage & Hydraulics
| NID Storage | 59 acre-ft |
| Max Storage | 59 acre-ft |
| Normal Storage | 30 acre-ft |
| Surface Area | 8 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 952 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Joliet Junior College |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 04/07/2023 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL01000 |
| Federal ID | IL01000 |
| More Info | State Dam Safety Program |