Simpson Lake Dam
Significant HazardNot Available ConditionEmergency Action Plan: No
Location
| State | Illinois |
| County | Johnson |
| Nearest City | ROBBS-OFFSTRAEM |
| River/Stream | TRIB BAY CREEK |
| Coordinates | 37.46757, -88.71736 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 23 ft |
| Dam Height | 23 ft |
| Dam Length | 690 ft |
| Year Completed | 1963 (63 years old) |
Storage & Hydraulics
| NID Storage | 222 acre-ft |
| Max Storage | 222 acre-ft |
| Normal Storage | 123 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | LEVI SIMPSON |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not Available |
| Last Inspection | 06/27/2024 |
| Emergency Action Plan | No |