Pierce Lake Dam
High HazardNot Available ConditionEmergency Action Plan: Yes
Location
| State | Illinois |
| County | Winnebago |
| Nearest City | NORTH FORK |
| River/Stream | WILLOW CREEK |
| Coordinates | 42.34622, -88.98694 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 46 ft |
| Dam Height | 46 ft |
| Dam Length | 470 ft |
| Year Completed | 1960 (66 years old) |
Storage & Hydraulics
| NID Storage | 4,785 acre-ft |
| Max Storage | 4,785 acre-ft |
| Normal Storage | 2,660 acre-ft |
| Surface Area | 162 acres |
| Drainage Area | 13 sq mi |
| Max Discharge | 30,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | ILLINOIS DEPARTMENT OF NATURAL RESOURCES |
| Owner Type | State |
| Hazard Classification | High |
| Condition Assessment | Not Available |
| Last Inspection | 07/23/2025 |
| Emergency Action Plan | Yes |