Sediment Pond 4a Reservoir Report
Nearby: Sediment Pond 5 Stateline Pond Dam
Last Updated: December 14, 2025
Sediment Pond 4a, located in Pleasanton, Kansas, is a privately owned rockfill dam designed by Alan Bowles, P.E.
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Summary
The dam stands at a height of 9.1 feet and has a storage capacity of 334.9 acre-feet, serving primarily for flood risk reduction in the area. With a low hazard potential and a condition assessment that is currently not rated, Sediment Pond 4a plays a crucial role in managing water resources and protecting against potential flooding events in Linn County.
Managed by the Kansas Department of Agriculture, Sediment Pond 4a has a normal storage capacity of 149.3 acre-feet and covers a surface area of 16.9 acres. The dam's drainage area is 0.71 square miles, with a maximum discharge capacity of 341 cubic feet per second. Despite the lack of a spillway type specified, the structure meets state regulatory requirements for inspection, permitting, and enforcement, ensuring its operational safety and compliance with water resource management standards.
With its strategic location and design features, Sediment Pond 4a contributes significantly to flood risk reduction efforts in the region, providing a vital buffer against potential inundation events. As a key component of the state's water infrastructure, this rockfill dam exemplifies the importance of sustainable water resource management and climate resilience in safeguarding communities and ecosystems against the impacts of extreme weather events and ensuring the long-term integrity of water supply systems in Kansas.
Dam Length |
800 |
Dam Height |
9.1 |
Primary Dam Type |
Rockfill |
Surface Area |
16.9 |
Drainage Area |
0.71 |
Nid Storage |
334.9 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
9 |
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.
Sediment Pond 4a