Lake Of The Woods 1 Dam Reservoir Report
Nearby: Lake Of The Woods 2 Dam Ylsa Lake Dam
Last Updated: December 23, 2025
Lake of The Woods 1 Dam, located in Monroe County, Illinois, was completed in 1974 and serves primarily for recreational purposes.
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Summary
This earth dam stands at a height of 21 feet and has a length of 468 feet, holding a storage capacity of 204 acre-feet. The dam is situated on the Trib Prairie Du Long Creek and is regulated by the Illinois Department of Natural Resources, with inspection and enforcement measures in place to ensure safety and compliance.
With a low hazard potential and a moderate risk assessment, Lake of The Woods 1 Dam is considered a relatively safe structure. The dam features uncontrolled spillways and outlets gates, with a spillway width of 35 feet. Although the condition assessment is not available, regular inspections are conducted every five years to monitor the dam's integrity. The dam's risk management measures and emergency action plans are currently not specified, but overall, the dam is deemed to meet safety guidelines.
Water resource and climate enthusiasts will appreciate the strategic location of Lake of The Woods 1 Dam within the St. Louis District, offering a picturesque setting for outdoor activities and water recreation. The dam's association with the Prairie Du Long Creek adds to its ecological significance, providing essential water resources for the surrounding area. As a privately owned structure, the dam plays a vital role in managing water flow and storage, contributing to the overall environmental balance and sustainability of the region.
Year Completed |
1974 |
Dam Length |
468 |
Dam Height |
21 |
River Or Stream |
TRIB PRAIRIE DU LONG CREEK |
Primary Dam Type |
Earth |
Nid Storage |
204 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
21 |
Seasonal Comparison
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Nearby Streamflow Levels
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.
Lake Of The Woods 1 Dam