Mcnary Lock And Dam - Pasco Levee 17a Reservoir Report
Last Updated: December 14, 2025
Mcnary Lock and Dam - Pasco Levee 17a, located on the Columbia River in Oregon, serves as a vital flood risk reduction infrastructure owned and operated by the US Army Corps of Engineers.
°F
°F
mph
Wind
%
Humidity
Summary
Completed in 1952, this earth dam stands at a height of 30 feet and is a key component in managing water levels along the river. With 12 associated structures, including levees and other support systems, the dam plays a crucial role in protecting the surrounding areas from potential flooding events.
The dam's hazard potential is classified as high, requiring regular inspections and risk management measures to ensure its structural integrity and functionality. The US Army Corps of Engineers actively monitors the dam's condition, prioritizes maintenance activities, and collaborates with local emergency managers to develop emergency action plans and evacuation procedures. Despite the inherent risks associated with dams, the agency remains committed to enhancing public awareness, preparedness, and response capabilities to mitigate potential threats and safeguard the community against flood-related emergencies.
In addition to its flood risk reduction purpose, Mcnary Lock and Dam - Pasco Levee 17a plays a critical role in water resource management and climate resilience efforts in the region. As part of a comprehensive strategy to address varying water levels and discharge patterns, the dam's operation is closely monitored and adjusted as needed to balance flood control, water storage, and environmental considerations. With ongoing risk management efforts in place, the dam continues to serve as a vital asset in protecting communities and ecosystems from the impacts of extreme weather events and changing climate conditions.
Year Completed |
1952 |
Dam Height |
30 |
River Or Stream |
COLUMBIA |
Primary Dam Type |
Earth |
Hazard Potential |
High |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Yakima River At Kiona
|
23800cfs |
Umatilla River Near Umatilla
|
516cfs |
Walla Walla River Near Touchet
|
1040cfs |
Yakima River At Mabton
|
28900cfs |
Columbia River Below Priest Rapids Dam
|
124000cfs |
Umatilla R At W Reservation Bndy Nr Pendleton
|
434cfs |
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.
Mcnary Lock And Dam - Pasco Levee 17a
Sacajawea Heritage Trail Tri-Cities