Hahn Lake Dam Reservoir Report
Nearby: Millers Lake Dam Jordan Lake Dam
Last Updated: December 10, 2025
Hahn Lake Dam, located in Blood, Illinois, was completed in 1947 and serves as a recreational water resource for the area.
°F
°F
mph
Wind
%
Humidity
Summary
Owned privately and regulated by the Illinois Department of Natural Resources, this earth dam stands at a height of 32 feet and spans 500 feet in length. With a storage capacity of 195 acre-feet, the dam is primarily used for recreation purposes, offering opportunities for fishing, boating, and other water-based activities.
Despite its low hazard potential, Hahn Lake Dam is subject to regular inspections every 5 years to ensure its structural integrity and safety. The dam features an uncontrolled spillway with a width of 125 feet, as well as outlet gates for water release. While the condition assessment is not available, the risk assessment for the dam is moderate, with a rating of 3 on the risk scale. Emergency action plans and inundation maps are not currently prepared, emphasizing the need for continued monitoring and mitigation measures to address potential risks.
Overall, Hahn Lake Dam provides a valuable recreational resource for the community while also presenting a moderate level of risk that requires careful management and oversight. With its picturesque location along Big Creek-Offstream, this dam serves as a vital water source for both residents and visitors, highlighting the importance of sustainable water resource management and climate adaptation strategies in the face of changing environmental conditions.
Year Completed |
1947 |
Dam Length |
500 |
Dam Height |
32 |
River Or Stream |
BIG CREEK-OFFSTREAM |
Primary Dam Type |
Earth |
Nid Storage |
195 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
32 |
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.
Hahn Lake Dam