Gridley Dam
Gridley Dam is an earth dam located in Cass County, Illinois, built in 1998. It carries a Low hazard potential classification.
About Gridley Dam
The primary purpose of Gridley Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Illinois Department Of Natural Resources (state). It impounds the Trib Panther Creek near Chandlerville.
The dam stands 51 feet tall and stretches 414 feet across, creates a reservoir covering 24 acres, has a maximum storage capacity of 475 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1998, the structure is 28 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. An emergency action plan is in place for this dam. The most recent inspection on record was 04/18/2024.
At 51 feet, this dam is taller than 93% of dams nationwide.
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Location
| State | Illinois |
| County | Cass |
| Nearest City | Chandlerville |
| River/Stream | Trib Panther Creek |
| Coordinates | 39.95531, -90.07421 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 51 ft |
| Dam Height | 51 ft |
| Dam Length | 414 ft |
| Year Completed | 1998 (28 years old) |
Storage & Hydraulics
| NID Storage | 475 acre-ft |
| Max Storage | 475 acre-ft |
| Normal Storage | 277 acre-ft |
| Surface Area | 24 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | ILLINOIS DEPARTMENT OF NATURAL RESOURCES |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not Available |
| Last Inspection | 04/18/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL50398 |
| Federal ID | IL50398 |
| More Info | State Dam Safety Program |