Shipman Reservoir Dam Reservoir Report
Last Updated: January 12, 2026
Shipman Reservoir Dam, located in Macoupin, Illinois, is a privately owned earth dam that was completed in 1967 for the primary purpose of water supply.
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Summary
With a height of 36 feet and a length of 385 feet, the dam holds a maximum storage capacity of 218 acre-feet and a normal storage capacity of 114 acre-feet. The reservoir covers a surface area of 13 acres and has a drainage area of 0.5 square miles, with a maximum discharge capacity of 1873 cubic feet per second.
Managed by the Illinois Department of Natural Resources (IDNR), Shipman Reservoir Dam is regulated, inspected, and enforced by the state. The dam has an uncontrolled spillway and outlet gates, with a spillway width of 55 feet. Although the condition assessment is not available, the hazard potential of the dam is categorized as significant, with a moderate risk level assigned. The last inspection was conducted in May 2018, with an inspection frequency of 3 years.
For water resource and climate enthusiasts, Shipman Reservoir Dam serves as a vital infrastructure for water supply in the region. The dam plays a crucial role in managing water resources and mitigating flood risks in the area. With its strategic location on Trib Coop Branch, the dam contributes to the sustainable utilization of water resources for various purposes. Despite its significant hazard potential, the dam's risk is being managed through regular inspections and risk assessments to ensure the safety and security of the surrounding communities.
Year Completed |
1967 |
Dam Length |
385 |
Dam Height |
36 |
River Or Stream |
TRIB COOP BRANCH |
Primary Dam Type |
Earth |
Surface Area |
13 |
Drainage Area |
0.5 |
Nid Storage |
218 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Nid Height |
36 |
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.
Shipman Reservoir Dam