Alsey Lake Dam Reservoir Report
Last Updated: December 21, 2025
Alsey Lake Dam, located in Scott County, Illinois, was completed in 1969 by the USDA NRCS and serves as a crucial water resource for the area.
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Summary
This private dam stands at a height of 27 feet and has a length of 290 feet, with a primary purpose of providing recreational opportunities. With a maximum storage capacity of 81 acre-feet, the dam helps manage water flow in the TRIB LITTLE SANDY CREEK, ensuring a stable water supply for the region.
State-regulated and inspected by the Illinois Department of Natural Resources, Alsey Lake Dam has a significant hazard potential and a moderate risk assessment level. The dam features an uncontrolled spillway and outlet gates, emphasizing the importance of proper maintenance and emergency preparedness. Despite the lack of available condition assessment data, the dam's risk management measures are crucial in ensuring the safety of the surrounding community in case of any unforeseen events.
With its picturesque location and essential role in water management, Alsey Lake Dam stands as a testament to the importance of sustainable water resource infrastructure. As climate change continues to impact water availability and quality, the careful monitoring and maintenance of dams like Alsey Lake are vital in ensuring the resilience of local ecosystems and communities.
Year Completed |
1969 |
Dam Length |
290 |
Dam Height |
27 |
River Or Stream |
TRIB LITTLE SANDY CREEK |
Primary Dam Type |
Earth |
Nid Storage |
81 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Nid Height |
27 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Illinois River At Valley City
|
4670cfs |
Bay Creek At Pittsfield
|
43cfs |
Macoupin Creek Near Kane
|
20cfs |
La Moine River At Ripley
|
23cfs |
Spring Creek At Springfield
|
6cfs |
Sangamon River At Petersburg
|
199cfs |
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.
Alsey Lake Dam