Lasalle Co. Nuclear Station Cooling Lake Dam
High HazardNot Available ConditionEmergency Action Plan: Yes
Location
| State | Illinois |
| County | LaSalle |
| Nearest City | MARSEILLES |
| River/Stream | TRIB ILLINOIS RIVER |
| Coordinates | 41.26717, -88.64284 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 43 ft |
| Dam Height | 43 ft |
| Dam Length | 37,942 ft |
| Year Completed | 1977 (49 years old) |
Storage & Hydraulics
| NID Storage | 44,167 acre-ft |
| Max Storage | 44,167 acre-ft |
| Normal Storage | 31,706 acre-ft |
| Surface Area | 2,058 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 5,884 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | EXELON GENERATION COMPANY, LLC |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Not Available |
| Last Inspection | 08/27/2025 |
| Emergency Action Plan | Yes |