Lake Summerset Dam
High HazardNot Available ConditionEmergency Action Plan: Yes
Location
| State | Illinois |
| County | Winnebago |
| Nearest City | DURAND |
| River/Stream | SOUTH BRANCH OTTER CREEK |
| Coordinates | 42.44806, -89.38435 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 44 ft |
| Dam Height | 44 ft |
| Dam Length | 1,794 ft |
| Year Completed | 1969 (57 years old) |
Storage & Hydraulics
| NID Storage | 7,312 acre-ft |
| Max Storage | 7,312 acre-ft |
| Normal Storage | 4,985 acre-ft |
| Surface Area | 301 acres |
| Drainage Area | 6 sq mi |
| Max Discharge | 1,230 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | LAKE SUMMERSET ASSOCIATION, INC. |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Not Available |
| Last Inspection | 10/13/2025 |
| Emergency Action Plan | Yes |