Sherman Dam is an earth dam located in Lee County, Illinois, built in 1991. It carries a Significant hazard potential classification.
Dam profile
NID height · 25 ft25 ft tall and 600 ft long, taller than 50% 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 Sherman Dam
The primary purpose of Sherman Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Tom Sherman (private). It impounds the Trib Plum Creek near Dixon.
The dam stands 25 feet tall and stretches 600 feet across, and has a maximum storage capacity of 125 acre-feet. Completed in 1991, the structure is 35 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 06/09/2022.
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Location
| State | Illinois |
| County | Lee |
| Nearest City | Dixon |
| River/Stream | Trib Plum Creek |
| Coordinates | 41.86689, -89.51185 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 600 ft |
| Year Completed | 1991 (35 years old) |
Storage & Hydraulics
| NID Storage | 125 acre-ft |
| Max Storage | 125 acre-ft |
| Normal Storage | 40 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Tom Sherman |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 06/09/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL50302 |
| Federal ID | IL50302 |
| More Info | State Dam Safety Program |