Long Pond Dam Reservoir Report
Nearby: Fraley Pond Heild Pond Dam
Last Updated: December 21, 2025
Long Pond Dam, located in Greene County, Illinois, was completed in 1965 by the USDA NRCS and serves as a critical habitat for fish and wildlife in the area.
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Summary
This private dam stands at 17 feet tall and spans 300 feet in length, with a storage capacity of 59 acre-feet and a surface area of 6 acres. Situated on TR- MACOUPIN CREEK, the dam's primary purpose is to provide fire protection, stock, and support a diverse range of aquatic life.
Managed by the Illinois Department of Natural Resources, Long Pond Dam is classified as an Earth dam with a stone core foundation, featuring an uncontrolled spillway with a width of 16 feet. The dam's maximum discharge capacity is 138 cubic feet per second, making it a crucial component of the local water resource infrastructure. Despite its moderate hazard potential, the dam's condition assessment remains unavailable, highlighting the need for ongoing monitoring and risk management measures to ensure its safety and functionality for the surrounding community.
Year Completed |
1965 |
Dam Length |
300 |
Dam Height |
17 |
River Or Stream |
TR- MACOUPIN CREEK |
Primary Dam Type |
Earth |
Surface Area |
6 |
Drainage Area |
0.11 |
Nid Storage |
59 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Undetermined |
Foundations |
Soil |
Nid Height |
17 |
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.
Long Pond Dam