Browns Lake Dam Reservoir Report
Nearby: Benson Pond Dam 1 Country Lake Dam
Last Updated: December 21, 2025
Located in Menard, Illinois, Browns Lake Dam is a privately owned structure that serves primarily for recreation purposes.
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Summary
Completed in 1974, this earth dam stands at a height of 27 feet and has a storage capacity of 62 acre-feet. Situated on TRIB ROCK CR, this dam covers a surface area of 5 acres and has a drainage area of 113 square miles.
Despite its low hazard potential, Browns Lake Dam is regulated by the Illinois Department of Natural Resources and undergoes regular inspections to ensure its safety and functionality. With a moderate risk assessment rating of 3, the dam has no history of significant modifications or incidents. The dam features an uncontrolled spillway with a width of 18 feet, and there are no outlet gates or associated structures.
Water resource and climate enthusiasts interested in Browns Lake Dam can appreciate its role in providing recreational opportunities while also recognizing the importance of its regulation and maintenance to prevent potential risks. With its tranquil surroundings and essential function in water management, this dam serves as a noteworthy site in the St. Louis District, offering both enjoyment and a reminder of the ongoing responsibilities in managing water resources.
Year Completed |
1974 |
Dam Height |
27 |
River Or Stream |
TRIB ROCK CR |
Primary Dam Type |
Earth |
Surface Area |
5 |
Drainage Area |
113 |
Nid Storage |
62 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
27 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Sangamon River At Petersburg
|
209cfs |
Spring Creek At Springfield
|
7cfs |
Sangamon River At Riverton
|
125cfs |
Salt Creek Near Greenview
|
204cfs |
Sangamon River Near Oakford
|
421cfs |
South Fork Sangamon River Nr Rochester
|
11cfs |
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.
Browns Lake Dam