Vienna Reservoir Dam is an earth dam located in Johnson County, Illinois, built in 1968. It carries a Low hazard potential classification.
Dam profile
NID height · 13 ft13 ft tall and 2,100 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 Vienna Reservoir Dam
The primary purpose of Vienna Reservoir 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 Vienna (local government). It impounds the Trib Little Cache Creek near Vienna.
The dam stands 13 feet tall and stretches 2,100 feet across, and has a maximum storage capacity of 55 acre-feet. Completed in 1968, the structure is well into its service life at over 50 years 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 07/26/2024.
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Location
| State | Illinois |
| County | Johnson |
| Nearest City | Vienna |
| River/Stream | Trib Little Cache Creek |
| Coordinates | 37.41981, -88.89179 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 13 ft |
| Dam Height | 13 ft |
| Dam Length | 2,100 ft |
| Year Completed | 1968 (58 years old) |
Storage & Hydraulics
| NID Storage | 55 acre-ft |
| Max Storage | 55 acre-ft |
| Normal Storage | 23 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Vienna |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 07/26/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL01088 |
| Federal ID | IL01088 |
| More Info | State Dam Safety Program |