Argyle Lake Dam
Significant HazardNot Available ConditionEmergency Action Plan: Yes
Location
| State | Illinois |
| County | McDonough |
| Nearest City | COLCHESTER |
| River/Stream | EAST FORK LA MOINE RIVER |
| Coordinates | 40.44932, -90.78813 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 58 ft |
| Dam Height | 58 ft |
| Dam Length | 670 ft |
| Year Completed | 1949 (77 years old) |
Storage & Hydraulics
| NID Storage | 4,040 acre-ft |
| Max Storage | 4,040 acre-ft |
| Normal Storage | 2,200 acre-ft |
| Surface Area | 114 acres |
| Drainage Area | 623 sq mi |
| Max Discharge | 13,580 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | ILLINOIS DEPARTMENT OF NATURAL RESOURCES |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Not Available |
| Last Inspection | 05/09/2025 |
| Emergency Action Plan | Yes |