Lake Of Egypt Dam
High HazardNot Available ConditionEmergency Action Plan: Yes
Location
| State | Illinois |
| County | Williamson |
| Nearest City | MARION-OFFSTREAM |
| River/Stream | SOUTH FORK SALINE RIVER |
| Coordinates | 37.62326, -88.94671 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 55 ft |
| Dam Height | 55 ft |
| Dam Length | 2,850 ft |
| Year Completed | 1962 (64 years old) |
Storage & Hydraulics
| NID Storage | 82,942 acre-ft |
| Max Storage | 82,942 acre-ft |
| Normal Storage | 41,215 acre-ft |
| Surface Area | 2,265 acres |
| Drainage Area | 33 sq mi |
| Max Discharge | 40,666 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | SOUTHERN ILLINOIS POWER COOPERATIVE |
| Owner Type | Public Utility |
| Hazard Classification | High |
| Condition Assessment | Not Available |
| Last Inspection | 11/11/2025 |
| Emergency Action Plan | Yes |