Macoupin Energy Smith Reservoir Dam Reservoir Report
Last Updated: January 11, 2026
Macoupin Energy Smith Reservoir Dam, also known as Smith Reservoir, is a privately owned dam located in Macoupin County, Illinois.
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Summary
Completed in 1969, this earth dam stands at a height of 58 feet and has a storage capacity of 1,784 acre-feet, primarily used for recreation and water supply purposes. The dam is situated on the tributary Spanish Needle Creek and is regulated by the Illinois Department of Natural Resources (IDNR).
With a spillway width of 85 feet and uncontrolled spillway and outlet gates, the dam has a high hazard potential and is inspected every five years to ensure its safety and integrity. Despite its age, the condition assessment of the dam is currently listed as not available, highlighting the need for ongoing monitoring and maintenance. In case of emergencies, an Emergency Action Plan (EAP) is in place, last revised in 2010, to guide responses and protect downstream communities from potential inundation risks.
Overall, Macoupin Energy Smith Reservoir Dam serves as a vital structure for water resource management in the region, providing recreational opportunities while also being a critical component of the local water supply infrastructure. As climate change continues to impact water resources, the maintenance and safety of dams like this one are crucial to ensure their resilience and effectiveness in the face of evolving environmental challenges.
Year Completed |
1969 |
Dam Length |
820 |
Dam Height |
58 |
River Or Stream |
TRIB SPANISH NEEDLE CREEK |
Primary Dam Type |
Earth |
Nid Storage |
1784 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
58 |
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.
Macoupin Energy Smith Reservoir Dam