Happy Holler Dam Reservoir Report
Nearby: Kelley Lake Dam Bashor Dam No. 1
Last Updated: December 12, 2025
Happy Holler Dam, located in Andrew, Missouri, is a state-regulated structure with a primary purpose of serving as a Fish and Wildlife Pond.
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Summary
Built in 1995 by the Missouri Department of Conservation, this Earth dam stands at a height of 43 feet and spans a length of 843 feet, holding a maximum storage capacity of 805 acre-feet. Situated on the Platte River, this dam not only provides recreational opportunities but also plays a crucial role in supporting the local fish and wildlife populations.
With a spillway width of 180 feet and a high hazard potential, Happy Holler Dam is closely monitored and inspected by the DAM AND RESERVOIR SAFETY PROGRAM. Despite its satisfactory condition assessment as of December 2007, the dam has a moderate risk assessment rating of 3. Emergency action plans are in place, although they may need updating, and the dam has been deemed to meet safety guidelines. The dam's risk management measures and inundation maps, however, are not clearly defined in the data, indicating room for improvement in emergency preparedness and response.
Overall, Happy Holler Dam serves as a vital water resource and habitat for the surrounding area. With its blend of recreational opportunities and wildlife conservation efforts, this structure highlights the importance of sustainable water management and climate resilience in ensuring the well-being of both ecosystems and local communities.
Year Completed |
1995 |
Dam Length |
843 |
Dam Height |
43 |
River Or Stream |
PLATTE RIVER |
Primary Dam Type |
Earth |
Surface Area |
62 |
Drainage Area |
2183 |
Nid Storage |
805 |
Structural Height |
43 |
Outlet Gates |
None |
Hazard Potential |
High |
Foundations |
Rock, Soil |
Nid Height |
43 |
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.
Happy Holler Dam