Lanny Jokers Dam Reservoir Report
Nearby: Miller Pond Dam 1 Miller Pond Dam 2
Last Updated: December 22, 2025
Lanny Jokers Dam, located in Macoupin County, Illinois, is a privately owned structure designed by Greene & Bradford.
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Summary
This earth dam, standing at a height of 41.9 feet, serves primarily for recreational purposes along the Trib Macoupin Creek. With a storage capacity of 470.1 acre-feet and a surface area of 28.4 acres, the dam offers opportunities for water-based activities and outdoor enjoyment in the picturesque surroundings of Summerville.
Managed by the Illinois Department of Natural Resources, Lanny Jokers Dam has a low hazard potential and a moderate risk assessment rating. While the condition assessment is currently not available, the dam undergoes regular inspections every five years to ensure its safety and functionality. The spillway, with a width of 40 feet, is uncontrolled, allowing for the controlled release of excess water during periods of high discharge, further reducing the risk of flooding and ensuring the integrity of the structure.
As a vital component of the local water resource infrastructure, Lanny Jokers Dam plays a crucial role in managing water flow and providing recreational opportunities for the community. With its peaceful surroundings and functional design, the dam stands as a testament to the harmonious coexistence of water resource management and outdoor recreation in the heart of Illinois.
Dam Length |
372 |
Dam Height |
41.9 |
River Or Stream |
TRIB MACOUPIN CREEK |
Primary Dam Type |
Earth |
Surface Area |
28.4 |
Drainage Area |
0.19 |
Nid Storage |
470.1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
42 |
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.
Lanny Jokers Dam