Grand Tower Station Ash Pond is an earth dam located in Jackson County, Illinois. It carries a Significant hazard potential classification.
Dam profile
NID height · 15 ft15 ft tall and 2,500 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Grand Tower Station Ash Pond
Grand Tower Station Ash Pond is a dam in Jackson, Illinois. The dam is owned by Grand Tower Energy Center, LLC (private). It impounds the Mississippi River - Offstream near Grand Tower.
The dam stands 15 feet tall and stretches 2,500 feet across, and has a maximum storage capacity of 150 acre-feet.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. The most recent inspection on record was 11/17/2025.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Illinois |
| County | Jackson |
| Nearest City | Grand Tower |
| River/Stream | Mississippi River - Offstream |
| Coordinates | 37.65707, -89.50429 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 2,500 ft |
Storage & Hydraulics
| NID Storage | 150 acre-ft |
| Max Storage | 150 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | Grand Tower Energy Center, LLC |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 11/17/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL50705 |
| Federal ID | IL50705 |
| More Info | State Dam Safety Program |