Boyles Lake Dam Reservoir Report
Nearby: Sutton Pond Dam Mitchell Lake Dam
Last Updated: December 21, 2025
Boyles Lake Dam, located in Mapleton, Illinois, was completed in 1972 and stands at a height of 63 feet with a length of 780 feet.
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Summary
The primary purpose of this earth dam, with a buttress core type, is for recreation, providing a storage capacity of 646 acre-feet. The dam is situated on Trib Mud Creek and is regulated by the Illinois Department of Natural Resources.
Despite being classified as having a low hazard potential, Boyles Lake Dam is subject to regular inspections with a frequency of every 5 years. The last inspection took place in September 2018, with the condition assessment listed as not available. The dam features an uncontrolled spillway and outlet gates, with a moderate risk assessment score of 3. While no emergency action plan (EAP) information is currently available, the dam is managed by a private entity and does not receive federal funding or oversight.
Boyles Lake Dam offers a picturesque setting for outdoor enthusiasts to enjoy recreational activities such as fishing, boating, and hiking. Situated within Tazewell County, this dam serves as a vital water resource for the local community while also providing a habitat for various wildlife species. Water resource and climate enthusiasts can appreciate the unique design and functionality of Boyles Lake Dam, as well as the importance of its role in maintaining the ecological balance of the surrounding area.
Year Completed |
1972 |
Dam Length |
780 |
Dam Height |
63 |
River Or Stream |
TRIB MUD CREEK |
Primary Dam Type |
Earth |
Nid Storage |
646 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
63 |
Seasonal Comparison
Weather Forecast
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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.
Boyles Lake Dam