Johnston City Lake Dam
Significant HazardNot Available ConditionEmergency Action Plan: No
Location
| State | Illinois |
| County | Williamson |
| Nearest City | JOHNSTON CITY |
| River/Stream | TRIB LAKE CREEK |
| Coordinates | 37.80238, -88.86662 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 14 ft |
| Dam Height | 14 ft |
| Dam Length | 855 ft |
| Year Completed | 1921 (105 years old) |
Storage & Hydraulics
| NID Storage | 601 acre-ft |
| Max Storage | 601 acre-ft |
| Normal Storage | 466 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | CITY OF JOHNSON CITY |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Not Available |
| Last Inspection | 04/23/2025 |
| Emergency Action Plan | No |