Happy Hollow Lake 2 Dam Reservoir Report
Nearby: Happy Hollow Lake Dam Daum Lake Dam
Last Updated: December 14, 2025
Happy Hollow Lake 2 Dam, also known as Upper Happy Hollow Lake, is a private dam located in Dahinda, Illinois.
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Summary
Completed in 1965, this earth dam stands at a height of 34 feet and has a length of 240 feet. With a primary purpose of recreation, the dam provides a storage capacity of 77 acre-feet, with a normal storage level of 15 feet.
Managed by the Illinois Department of Natural Resources, the dam is state-regulated and undergoes regular inspections to ensure its safety and compliance with regulatory standards. The dam's spillway type is uncontrolled, with an unlisted foundation type. Despite its significant hazard potential, the risk assessment for Happy Hollow Lake 2 Dam is moderate. The dam's emergency action plan status and risk management measures are currently not available.
Located near the tributary of Spoon River, this dam offers not only recreational opportunities but also serves as an important resource for water management in the region. With its rich history and commitment to safety, Happy Hollow Lake 2 Dam is a vital component of the local ecosystem and a point of interest for water resource and climate enthusiasts.
Year Completed |
1965 |
Dam Length |
240 |
Dam Height |
34 |
River Or Stream |
TRIB SPOON RIVER |
Primary Dam Type |
Earth |
Nid Storage |
77 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Nid Height |
34 |
Seasonal Comparison
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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.
Happy Hollow Lake 2 Dam