Collins Station Cooling Lake Dam
Collins Station Cooling Lake Dam is an earth dam located in Grundy County, Illinois, built in 1975. It carries a Significant hazard potential classification.
About Collins Station Cooling Lake Dam
Collins Station Cooling Lake Dam is a dam in Grundy, Illinois. The dam is owned by Nrg (private). It impounds the Illinois River-offstream near Morris.
The dam stands 27 feet tall and stretches 32,736 feet across, creates a reservoir covering 1,990 acres, has a maximum storage capacity of 29,600 acre-feet, and collects water from a drainage area of 5 square miles. Completed in 1975, 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. An emergency action plan is in place for this dam. The most recent inspection on record was 03/21/2025.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Illinois |
| County | Grundy |
| Nearest City | Morris |
| River/Stream | Illinois River-offstream |
| Coordinates | 41.38491, -88.32142 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 27 ft |
| Dam Height | 27 ft |
| Dam Length | 32,736 ft |
| Year Completed | 1975 (51 years old) |
Storage & Hydraulics
| NID Storage | 29,600 acre-ft |
| Max Storage | 29,600 acre-ft |
| Normal Storage | 23,600 acre-ft |
| Surface Area | 1,990 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 3,637 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | NRG |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not Available |
| Last Inspection | 03/21/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL01232 |
| Federal ID | IL01232 |
| More Info | State Dam Safety Program |