Highland Old City Reservoir Dam is an earth dam located in Madison County, Illinois, built in 1912. It carries a Low hazard potential classification.
Dam profile
NID height · 15 ft15 ft tall and 668 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 Highland Old City Reservoir Dam
The primary purpose of Highland Old City Reservoir Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by City of Highland (local government). It impounds the Trib East Fork Silver Creek near Mascoutah.
The dam stands 15 feet tall and stretches 668 feet across, and has a maximum storage capacity of 121 acre-feet. Completed in 1912, the structure is over a century old.
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 07/11/2025.
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Location
| State | Illinois |
| County | Madison |
| Nearest City | Mascoutah |
| River/Stream | Trib East Fork Silver Creek |
| Coordinates | 38.76595, -89.69551 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 668 ft |
| Year Completed | 1912 (114 years old) |
Storage & Hydraulics
| NID Storage | 121 acre-ft |
| Max Storage | 121 acre-ft |
| Normal Storage | 51 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | City of Highland |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 07/11/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00179 |
| Federal ID | IL00179 |
| More Info | State Dam Safety Program |