Greenfield City Dam is an earth dam located in Greene County, Illinois, built in 1959. It carries a Significant hazard potential classification.
Dam profile
NID height · 33 ft33 ft tall and 650 ft long, taller than 76% 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 Greenfield City Dam
The primary purpose of Greenfield City Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by City of Greenfield (local government). It impounds the Trib Rubicon Creek near Greenfield.
The dam stands 33 feet tall and stretches 650 feet across, creates a reservoir covering 52 acres, has a maximum storage capacity of 899 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1959, the structure is well into its service life at over 50 years old.
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. An emergency action plan is in place for this dam. The most recent inspection on record was 05/24/2023.
At 33 feet, this dam is taller than 76% of dams nationwide.
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Location
| State | Illinois |
| County | Greene |
| Nearest City | Greenfield |
| River/Stream | Trib Rubicon Creek |
| Coordinates | 39.33891, -90.20019 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 33 ft |
| Dam Height | 33 ft |
| Dam Length | 650 ft |
| Year Completed | 1959 (67 years old) |
Storage & Hydraulics
| NID Storage | 899 acre-ft |
| Max Storage | 899 acre-ft |
| Normal Storage | 564 acre-ft |
| Surface Area | 52 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 984 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Greenfield |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 05/24/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL00761 |
| Federal ID | IL00761 |
| More Info | State Dam Safety Program |