Superior 4 Dam is an earth dam located in Macoupin County, Illinois, built in 1950. It carries a Low hazard potential classification.
Dam profile
NID height · 20 ft20 ft tall. 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 Superior 4 Dam
Superior 4 Dam is a dam in Macoupin, Illinois. The dam is owned by Unknown (private). It impounds the West Fork Cahokia Creek near Wilsonville.
The dam stands 20 feet tall, and has a maximum storage capacity of 200 acre-feet. Completed in 1950, the structure is well-established, with more than 75 years of service.
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 01/26/1988. That was over 38 years ago.
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Location
| State | Illinois |
| County | Macoupin |
| Nearest City | Wilsonville |
| River/Stream | West Fork Cahokia Creek |
| Coordinates | 39.05805, -89.86085 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Year Completed | 1950 (76 years old) |
Storage & Hydraulics
| NID Storage | 200 acre-ft |
| Max Storage | 200 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | Unknown |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 01/26/1988 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL50089 |
| Federal ID | IL50089 |
| More Info | State Dam Safety Program |