Younquist Lake Dam Reservoir Report
Last Updated: December 18, 2025
Younquist Lake Dam, also known as Youngquist Lake, is a private-owned structure located in Warren, Illinois.
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Summary
Built in 1939 by the USDA NRCS, this earth dam stands at a height of 20 feet and has a length of 342 feet. Its primary purpose is for recreation, providing a storage capacity of 69 acre-feet with a normal storage level of 41 acre-feet.
Managed by the Illinois Department of Natural Resources, the dam is regulated, inspected, and enforced by the state, ensuring its safety and compliance with regulations. With a low hazard potential and moderate risk assessment, the dam has an uncontrolled spillway with a width of 33 feet. While the condition assessment is not available, the last inspection took place in July 2015, with a scheduled inspection frequency of every 5 years.
For water resource and climate enthusiasts, Younquist Lake Dam offers a glimpse into the careful management and regulation of water infrastructure in Illinois. Its historical significance, recreational purpose, and moderate risk assessment make it an intriguing subject for those interested in the intersection of dams, water resources, and environmental stewardship.
Year Completed |
1939 |
Dam Length |
342 |
Dam Height |
20 |
River Or Stream |
TRIB CEDAR CREEK |
Primary Dam Type |
Earth |
Nid Storage |
69 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Spoon River At London Mills
|
86cfs |
Henderson Creek Near Oquawka
|
45cfs |
Spoon River At Seville
|
143cfs |
Pope Creek Near Keithsburg
|
25cfs |
Edwards River Near Orion
|
66cfs |
Edwards River Near New Boston
|
41cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Younquist Lake Dam