Koster Pond Dam Reservoir Report
Nearby: Fraley Pond Kenneth Berry Pond Dam
Last Updated: December 21, 2025
Koster Pond Dam, located in Greene County, Illinois, is a privately owned structure with a primary purpose of serving as a Fish and Wildlife Pond.
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Summary
Constructed in 1963 by USDA NRCS, this Earth dam boasts a height of 27 feet and a length of 134 feet, providing a storage capacity of 25 acre-feet. Situated on Sand Creek in the city of Spanky, the dam plays a crucial role in fire protection, stock maintenance, and small fish pond management within the surrounding area.
Managed and regulated by the Illinois Department of Natural Resources, Koster Pond Dam is equipped with an uncontrolled spillway and outlet gates. Despite being classified with an undetermined hazard potential, the dam's risk assessment indicates a moderate level of risk. With a drainage area of 0.05 square miles and a surface area of 2 acres, the dam contributes significantly to the local ecosystem and enhances the biodiversity of the region.
The dam's strategic location and design make it a key player in maintaining a balance between water resource management and wildlife conservation. With its rich history and ongoing regulatory oversight, Koster Pond Dam stands as a testament to the importance of sustainable infrastructure development in the face of evolving climate challenges.
Year Completed |
1963 |
Dam Length |
134 |
Dam Height |
27 |
River Or Stream |
SAND CREEK |
Primary Dam Type |
Earth |
Surface Area |
2 |
Drainage Area |
0.05 |
Nid Storage |
25 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Undetermined |
Foundations |
Soil |
Nid Height |
27 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Macoupin Creek Near Kane
|
20cfs |
Mill Creek Near Florissant
|
0cfs |
Coldwater Creek Near Black Jack
|
7cfs |
Illinois River At Valley City
|
4670cfs |
Bay Creek At Pittsfield
|
43cfs |
Missouri River At St. Charles
|
34200cfs |
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.
Koster Pond Dam