Younquist Lake Dam is an earth dam located in Warren County, Illinois, built in 1939. It carries a Low hazard potential classification.
Dam profile
NID height · 20 ft20 ft tall and 342 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 Younquist Lake Dam
The primary purpose of Younquist Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Gene Youngquist (private). It impounds the Trib Cedar Creek near Abingdon-offstream.
The dam stands 20 feet tall and stretches 342 feet across, and has a maximum storage capacity of 69 acre-feet. Completed in 1939, 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 08/04/2024.
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Location
| State | Illinois |
| County | Warren |
| Nearest City | Abingdon-offstream |
| River/Stream | Trib Cedar Creek |
| Coordinates | 40.86946, -90.50521 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 342 ft |
| Year Completed | 1939 (87 years old) |
Storage & Hydraulics
| NID Storage | 69 acre-ft |
| Max Storage | 69 acre-ft |
| Normal Storage | 41 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Gene Youngquist |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 08/04/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00470 |
| Federal ID | IL00470 |
| More Info | State Dam Safety Program |