Lake Petersburg Dam
High HazardNot Available ConditionEmergency Action Plan: Yes
Location
| State | Illinois |
| County | Menard |
| Nearest City | PETERSBURG |
| River/Stream | TRIB SANGAMON RIVER |
| Coordinates | 39.98943, -89.84794 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 85 ft |
| Dam Height | 85 ft |
| Dam Length | 1,300 ft |
| Year Completed | 1961 (65 years old) |
Storage & Hydraulics
| NID Storage | 6,703 acre-ft |
| Max Storage | 6,703 acre-ft |
| Normal Storage | 4,303 acre-ft |
| Max Discharge | 1,985 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | LAKE PETERSBURG ASSOCIATION |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Not Available |
| Last Inspection | 03/20/2025 |
| Emergency Action Plan | Yes |