Mcnary Lock And Dam Reservoir Report
Last Updated: December 13, 2025
Mcnary Lock and Dam, also known as Lake Wallula, is a crucial structure located on the Columbia River in Oregon.
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Summary
Constructed in 1954 by the US Army Corps of Engineers, this concrete dam serves multiple purposes, including navigation, fish and wildlife pond, hydroelectric power generation, irrigation, and recreation. With a structural height of 220 feet and a spillway width of 1100 feet, the dam plays a vital role in managing water levels and controlling the flow of the river.
This high-hazard potential dam is constantly monitored and maintained by the US Army Corps of Engineers to mitigate flood risks and ensure structural integrity. The agency works closely with local emergency managers and the public to raise awareness about the dam and develop emergency response plans. Regular inspections, risk assessments, and updates to the emergency action plan are conducted to address any potential issues and ensure the safety of surrounding communities. Despite the inherent risks associated with dams, the USACE's proactive approach and risk management measures help to safeguard against unexpected events and maintain the dam's functionality.
In the face of severe weather events and unpredictable water levels, the Mcnary Lock and Dam serves as a crucial infrastructure for water resource management in the region. By balancing the needs of navigation, power generation, and flood control, this landmark demonstrates the importance of sustainable water resource management in the face of climate change challenges. As enthusiasts and stakeholders in water resources and climate, understanding the intricate operations and risk management strategies of Mcnary Lock and Dam provides valuable insights into the complex interplay between human infrastructure and natural systems.
Year Completed |
1954 |
Dam Length |
7365 |
River Or Stream |
COLUMBIA RIVER |
Primary Dam Type |
Concrete |
Surface Area |
38800 |
Length Of Locks |
683 |
Hydraulic Height |
75 |
Drainage Area |
214000 |
Nid Storage |
1350000 |
Structural Height |
220 |
Outlet Gates |
Vertical Lift - 0 |
Hazard Potential |
High |
Nid Height |
220 |
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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Mcnary Lock And Dam
Nugent Park