Mayfair Reservoir Dam Reservoir Report
Nearby: Fullersburg Dam Bush Hill Dam
Last Updated: December 5, 2025
Mayfair Reservoir Dam, located in Westchester, Illinois, was completed in 1977 and serves as a crucial flood risk reduction structure along the TRIB SALT CREEK.
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Summary
Owned by the local government and regulated by the Illinois Department of Natural Resources, this Earth-type dam stands at a height of 9 feet and spans 70 feet in length, with a storage capacity of 100 acre-feet. Despite its high hazard potential, the condition assessment of the dam is currently listed as "Not Available", highlighting the need for ongoing monitoring and maintenance to ensure its structural integrity.
With a drainage area of 1.5 square miles, Mayfair Reservoir Dam plays a vital role in protecting the surrounding community from potential flooding events. The dam features an uncontrolled spillway and outlet gates, underscoring the importance of proper management and oversight to mitigate any risks associated with its operation. While the dam's risk assessment is classified as moderate, the lack of recent inspection data raises concerns about the overall safety and preparedness of the structure in the face of potential emergencies.
As water resource and climate enthusiasts continue to monitor the status of Mayfair Reservoir Dam, it is imperative that state and local authorities prioritize regular inspections and maintenance to uphold the dam's functionality and safeguard the community from flood-related hazards. With its strategic location and significant impact on flood risk reduction, this Earth-type dam serves as a critical infrastructure asset in Cook County, Illinois, underscoring the importance of proactive risk management measures to ensure the safety and resilience of the surrounding area.
Year Completed |
1977 |
Dam Length |
70 |
Dam Height |
9 |
River Or Stream |
TRIB SALT CREEK |
Primary Dam Type |
Earth |
Surface Area |
9 |
Drainage Area |
1.5 |
Nid Storage |
100 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
9 |
Seasonal Comparison
Weather Forecast
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.
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