K2h Farms Mcnary No 1 Reservoir Reservoir Report
Last Updated: December 13, 2025
Situated in Benton, Washington, the K2h Farms Mcnary No 1 Reservoir, also known as the U & I Mcnary No.
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Summary
1 Reservoir Dam, is a privately-owned structure designed for irrigation purposes. Completed in 1980, this Earth-type dam boasts a hydraulic height of 15 feet and a length of 1600 feet, providing a storage capacity of 125 acre-feet. Located on the Columbia River-Offstream, this reservoir plays a crucial role in supporting agricultural activities in the region.
Managed by the Washington Department of Ecology, this reservoir has been deemed to have low hazard potential and has not been rated for its condition assessment. Despite its age, the dam has been regularly inspected and meets state regulatory standards. With a normal storage capacity of 87 acre-feet and a maximum discharge rate of 250 cubic feet per second, this structure ensures a reliable water supply for irrigation needs. Its strategic location and ample storage capacity make it a vital resource for water management in the area.
The K2h Farms Mcnary No 1 Reservoir stands as a testament to effective water resource management in Washington. With its efficient design and regulatory compliance, this reservoir serves as a lifeline for agricultural activities in the region, contributing to the overall sustainability of water usage. As climate change continues to impact water resources, structures like these play a crucial role in ensuring a secure water supply for future generations of farmers and residents in the area.
Year Completed |
1980 |
Dam Length |
1600 |
River Or Stream |
Columbia River-Offstream |
Primary Dam Type |
Earth |
Surface Area |
10 |
Hydraulic Height |
15 |
Drainage Area |
0.11 |
Nid Storage |
125 |
Structural Height |
15 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
15 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Umatilla River Near Umatilla
|
713cfs |
Yakima River At Kiona
|
27000cfs |
Walla Walla River Near Touchet
|
1330cfs |
Umatilla R At W Reservation Bndy Nr Pendleton
|
573cfs |
Yakima River At Mabton
|
32100cfs |
Willow Creek At Morgan Street
|
2cfs |
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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Umatilla Marina RV Park
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Plymouth Park
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Sand Station
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K2h Farms Mcnary No 1 Reservoir
Nugent Park