Thompson Pond Dam
Thompson Pond Dam is an earth dam located in Henry County, Illinois, built in 1972. It carries a Low hazard potential classification.
About Thompson Pond Dam
The primary purpose of Thompson Pond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by D. E. Thompson (private). It impounds the Trib Edwards River near Andover-offsteam.
The dam stands 21 feet tall and stretches 300 feet across, and has a maximum storage capacity of 76 acre-feet. Completed in 1972, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. The most recent inspection on record was 05/06/2025.
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Location
| State | Illinois |
| County | Henry |
| Nearest City | Andover-offsteam |
| River/Stream | Trib Edwards River |
| Coordinates | 41.17902, -90.19525 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 21 ft |
| Dam Height | 21 ft |
| Dam Length | 300 ft |
| Year Completed | 1972 (54 years old) |
Storage & Hydraulics
| NID Storage | 76 acre-ft |
| Max Storage | 76 acre-ft |
| Normal Storage | 44 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | D. E. THOMPSON |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Available |
| Last Inspection | 05/06/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00484 |
| Federal ID | IL00484 |
| More Info | State Dam Safety Program |