Thunderbird Lake Dam
Low HazardNot Available ConditionEmergency Action Plan: No
Location
| State | Illinois |
| County | Jersey |
| Nearest City | ALTON ON MISSISSIPPI |
| River/Stream | TR- LITTLE PIASA CREEK |
| Coordinates | 39.03885, -90.16686 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 28 ft |
| Dam Height | 28 ft |
| Dam Length | 300 ft |
| Year Completed | 1965 (61 years old) |
Storage & Hydraulics
| NID Storage | 48 acre-ft |
| Max Storage | 48 acre-ft |
| Normal Storage | 32 acre-ft |
| Surface Area | 4 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 194 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | UNKNOWN;UNKNOWN |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Available |
| Last Inspection | 06/23/2025 |
| Emergency Action Plan | No |