Thorton Quarry Gap Dam
High HazardNot Available ConditionEmergency Action Plan: Yes
Location
| State | Illinois |
| County | Cook |
| Nearest City | THORNTON |
| River/Stream | THORNTON QUARRY |
| Coordinates | 41.57987, -87.61897 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 116 ft |
| Dam Height | 116 ft |
| Dam Length | 220 ft |
| Year Completed | 2013 (13 years old) |
Storage & Hydraulics
| NID Storage | 9,900 acre-ft |
| Max Storage | 9,900 acre-ft |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | METROPOLITAN WATER RECLAMATION DISTRICT |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Not Available |
| Last Inspection | 05/13/2025 |
| Emergency Action Plan | Yes |