Lake Piasa Dam
Low HazardNot Available ConditionEmergency Action Plan: No
Location
| State | Illinois |
| County | Jersey |
| Nearest City | ALTON |
| River/Stream | LITTLE PIASA CREEK-OFFSTREAM |
| Coordinates | 39.02031, -90.19505 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 47 ft |
| Dam Height | 47 ft |
| Dam Length | 515 ft |
| Year Completed | 1963 (63 years old) |
Storage & Hydraulics
| NID Storage | 292 acre-ft |
| Max Storage | 292 acre-ft |
| Normal Storage | 235 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | LAKE PIASA BOARD OF TRUSTEES |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not Available |
| Last Inspection | 08/27/2025 |
| Emergency Action Plan | No |