Koreis Dam Reservoir Report
Last Updated: December 14, 2025
Koreis Dam, located in Franklin, Washington, was completed in 1982 and serves primarily for irrigation purposes.
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Summary
This private dam, standing at a height of 8 feet with a structural height of 5 feet, holds a maximum storage capacity of 82 acre-feet and a normal storage capacity of 52 acre-feet. The dam's low hazard potential and unlisted/unknown foundation make it a crucial water resource infrastructure in the region.
Managed by the Washington Dept of Ecology, Koreis Dam is regulated, inspected, and enforced by the state authorities to ensure its safety and functionality. Situated on Tr-Siphon Creek-Offstream, the dam plays a vital role in managing water resources in the area. With a surface area of 13 acres and a drainage area of 0.03 square miles, Koreis Dam provides essential water supply for agricultural activities while minimizing the risk of potential hazards.
Although the dam's condition is currently not rated, its emergency action plan and risk management measures are yet to be fully assessed. With its strategic location and vital role in irrigation, Koreis Dam stands as a key infrastructure for water resource management in Franklin, Washington, under the oversight of the Washington state authorities.
Year Completed |
1982 |
Dam Length |
5900 |
River Or Stream |
Tr-Siphon Creek-Offstream |
Primary Dam Type |
Earth |
Surface Area |
13 |
Hydraulic Height |
8 |
Drainage Area |
0.03 |
Nid Storage |
82 |
Structural Height |
5 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
8 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Yakima River At Kiona
|
27000cfs |
Columbia River Below Priest Rapids Dam
|
123000cfs |
Crab Creek Near Beverly
|
160cfs |
Crab Creek Near Moses Lake
|
28cfs |
Walla Walla River Near Touchet
|
1330cfs |
Yakima River At Mabton
|
32100cfs |
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.
Koreis Dam