Gross Farms Dam is an earth dam located in Morgan County, Illinois, built in 2005. It carries a Low hazard potential classification.
Dam profile
NID height · 27 ft27 ft tall and 395 ft long, taller than 59% 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 Gross Farms Dam
The primary purpose of Gross Farms Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by William P. Gross, Et Al (private). It impounds the Trib Sandy Creek near Winchester.
The dam stands 27 feet tall and stretches 395 feet across, creates a reservoir covering 20 acres, has a maximum storage capacity of 335 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 2005, the structure is relatively new.
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 08/15/2025.
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Location
| State | Illinois |
| County | Morgan |
| Nearest City | Winchester |
| River/Stream | Trib Sandy Creek |
| Coordinates | 39.66999, -90.29216 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 27 ft |
| Dam Height | 27 ft |
| Dam Length | 395 ft |
| Year Completed | 2005 (21 years old) |
Storage & Hydraulics
| NID Storage | 335 acre-ft |
| Max Storage | 335 acre-ft |
| Normal Storage | 220 acre-ft |
| Surface Area | 20 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 1,710 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | William P. Gross, Et Al |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 08/15/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL50494 |
| Federal ID | IL50494 |
| More Info | State Dam Safety Program |