Mcmann Lake Dam Reservoir Report
Nearby: International Coal/Viper/North Slurry Impoundment Dam International Coal/Viper/Freshwater Impoundment
Last Updated: December 21, 2025
Mcmann Lake Dam, located in Lincoln, Illinois, was completed in 1970 with a primary purpose of recreation.
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Summary
This private earth dam stands at a height of 19 feet and stretches 465 feet in length, providing a storage capacity of 103 acre-feet for the Mcmann Lake reservoir. The dam is regulated by the Illinois Department of Natural Resources and undergoes regular inspections to ensure its safety and functionality.
The dam's spillway is uncontrolled with a width of 82 feet, and it poses a low hazard potential according to risk assessments. Despite its moderate risk rating, the Mcmann Lake Dam has not had its condition assessment updated, and emergency action plans have not been prepared or reviewed recently. As a significant feature along the TRIB PIKE CREEK, this dam serves as a vital component for water resource management and recreational activities in the area. Enthusiasts of water resources and climate will find the Mcmann Lake Dam an intriguing structure to explore and study.
With its unique design and historical significance, the Mcmann Lake Dam offers a glimpse into the engineering practices of the past and the importance of water infrastructure in supporting local communities. As climate change continues to impact water resources, understanding the role of dams like Mcmann Lake in managing water flow and providing recreational opportunities becomes increasingly crucial. Explore this hidden gem in Menard County, Illinois, and appreciate the intersection of human ingenuity and environmental stewardship at Mcmann Lake Dam.
Year Completed |
1970 |
Dam Length |
465 |
Dam Height |
19 |
River Or Stream |
TRIB PIKE CREEK |
Primary Dam Type |
Earth |
Nid Storage |
103 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
19 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Salt Creek Near Greenview
|
232cfs |
Sangamon River At Petersburg
|
199cfs |
Lake Fork Near Cornland
|
22cfs |
Sangamon River At Riverton
|
188cfs |
Spring Creek At Springfield
|
6cfs |
Sangamon River Near Oakford
|
582cfs |
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.
Mcmann Lake Dam