Duck Creek Gypsum Stack Dam is an earth dam located in Fulton County, Illinois. It carries a Low hazard potential classification.
Dam profile
NID height · 45 ft45 ft tall and 4,900 ft long, taller than 90% of U.S. dams with a recorded height. 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 Duck Creek Gypsum Stack Dam
The primary purpose of Duck Creek Gypsum Stack Dam is tailings. Tailings dams contain waste material from mining operations — typically a slurry of finely ground rock left over after valuable minerals have been extracted. These structures require ongoing monitoring because tailings can contain heavy metals and other contaminants. The dam is owned by Dynegy Midwest Generation, Inc. (public utility). It impounds the Trib Duck Creek near Liverpool.
The dam stands 45 feet tall and stretches 4,900 feet across, creates a reservoir covering 8 acres, has a maximum storage capacity of 773 acre-feet, and collects water from a drainage area of 0 square miles.
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 09/15/2025.
At 45 feet, this dam is taller than 90% of dams nationwide.
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Location
| State | Illinois |
| County | Fulton |
| Nearest City | Liverpool |
| River/Stream | Trib Duck Creek |
| Coordinates | 40.50689, -89.98702 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 45 ft |
| Dam Height | 45 ft |
| Dam Length | 4,900 ft |
Storage & Hydraulics
| NID Storage | 773 acre-ft |
| Max Storage | 773 acre-ft |
| Normal Storage | 632 acre-ft |
| Surface Area | 8 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 550 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Tailings |
| Owner | Dynegy Midwest Generation, Inc. |
| Owner Type | Public Utility |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 09/15/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL50573 |
| Federal ID | IL50573 |
| More Info | State Dam Safety Program |