Koning "E" Reservoir Reservoir Report
Last Updated: December 13, 2025
Koning "E" Reservoir, located in Polk, Oregon, is a significant earth dam structure completed in 1995 for irrigation purposes.
°F
°F
mph
Wind
%
Humidity
Summary
The reservoir has a storage capacity of 90 acre-feet and covers an area of 4.2 acres, serving as a vital water resource for the surrounding agricultural lands. The dam stands at a height of 24 feet and spans a length of 600 feet, providing essential water supply management for the region.
Managed by a private owner, Koning "E" Reservoir is regulated by the Oregon Water Resources Department, ensuring state jurisdiction and permitting for its operations. The dam is situated on an unnamed tributary of Ash Swale, contributing to the local drainage area of 0.34 square miles. Despite its significant hazard potential, the condition assessment of the dam is currently not rated, emphasizing the importance of regular inspections and risk management measures to safeguard the water resources and climate resilience provided by Koning "E" Reservoir.
With its strategic location on US Highway 99W and proximity to Portland District, Koning "E" Reservoir plays a crucial role in supporting irrigation activities in the area. The dam designer, Wilhelm, has created a sustainable water storage solution that enhances the agricultural productivity of the region while maintaining compliance with state regulatory agencies. As water resource and climate enthusiasts, it is essential to recognize the vital role of infrastructure like Koning "E" Reservoir in ensuring water security and resilience in the face of changing environmental conditions.
Year Completed |
1995 |
Dam Length |
600 |
Dam Height |
24 |
River Or Stream |
UNNAMED TRIB/ASH SWALE |
Primary Dam Type |
Earth |
Surface Area |
4.2 |
Drainage Area |
0.34 |
Nid Storage |
90 |
Hazard Potential |
Significant |
Nid Height |
24 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Willamette River At Salem
|
35800cfs |
Luckiamute River Near Suver
|
3790cfs |
South Yamhill River At Mcminnville
|
8310cfs |
Zollner Creek Near Mt Angel
|
320cfs |
Silver Creek At Silverton
|
52cfs |
Abiqua Creek At Silverton
|
74cfs |
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.
Koning "E" Reservoir
Keizer Rapids