D. O. Allen Dam Reservoir Report
Nearby: Gardner Dam Mallow Lake Dam
Last Updated: December 25, 2025
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Summary
O. Allen Dam, located in Ozark, Missouri, along the Gardner Hollow river, was completed in 1985 for the primary purpose of recreation. This private earth dam stands at a height of 25 feet and has a storage capacity of 160 acre-feet, with a normal storage level of 100 acre-feet. Despite not being regulated by the state, the dam has a high hazard potential, indicating the need for proper maintenance and monitoring.
The dam, owned by a private entity, is not subject to state jurisdiction or permitting, but it still plays a crucial role in providing recreational opportunities in the area. With a surface area of 12 acres and a drainage area of 450 square miles, the dam serves as a popular spot for outdoor enthusiasts and nature lovers. However, its high hazard potential underscores the importance of proper risk management measures and emergency preparedness.
Although the condition of D. O. Allen Dam is currently not rated, it is essential for authorities to conduct regular inspections and assessments to ensure its structural integrity and safety. As a significant feature in the region's landscape, the dam not only provides recreational benefits but also highlights the delicate balance between water resource management and climate resilience. Engaging in proactive risk management practices will be crucial in safeguarding both the dam and the surrounding environment for future generations.
Year Completed |
1985 |
Dam Height |
25 |
River Or Stream |
GARDNER HOLLOW |
Primary Dam Type |
Earth |
Surface Area |
12 |
Drainage Area |
450 |
Nid Storage |
160 |
Structural Height |
25 |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Bryant Creek Near Tecumseh
|
185cfs |
North Fork River Near Tecumseh
|
377cfs |
Beaver Creek At Bradleyville
|
53cfs |
White River Near Norfork
|
1520cfs |
Bull Creek Near Walnut Shade
|
6cfs |
White River At Calico Rock
|
1970cfs |
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.
D. O. Allen Dam