Standard City Lake Dam Reservoir Report
Nearby: Denbys Pond Dam Whites Pond Dam
Last Updated: January 12, 2026
Standard City Lake Dam, also known as Schoper Lake, is a private earth dam located in Carlinville-Offstream, Illinois.
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Summary
Built in 1920 with a height of 33 feet and a length of 683 feet, this dam primarily serves as a recreational facility for water enthusiasts in the area. The dam has a low hazard potential and is regulated by the Illinois Department of Natural Resources, with regular inspections conducted every five years to ensure its safety and integrity.
The dam has a storage capacity of 633 acre-feet, with a normal storage level of 445 acre-feet. It is situated on the Trib Macoupin Creek and is surrounded by the beautiful Macoupin County countryside. Despite its uncontrolled spillway and outlet gates, the dam has a moderate risk assessment rating of 3, indicating the need for ongoing risk management measures. With its rich history and scenic location, Standard City Lake Dam offers a peaceful retreat for water resource and climate enthusiasts to enjoy nature and outdoor activities.
Year Completed |
1920 |
Dam Length |
683 |
Dam Height |
33 |
River Or Stream |
TRIB MACOUPIN CREEK |
Primary Dam Type |
Earth |
Nid Storage |
633 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
33 |
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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.
Standard City Lake Dam