Nada Dam Reservoir Report

Last Updated: December 15, 2025

Nada Dam, located in Leavenworth, Washington, is a Federal-owned structure managed by the Fish and Wildlife Service with a primary purpose of water supply.


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Summary

Built in 1939, this buttress dam stands at 9 feet high with a length of 24 feet, providing a storage capacity of 55 acre-feet. The dam is situated on an unnamed tributary to Snow Creek, within the Seattle District of the US Army Corps of Engineers.

Although the hazard potential is considered low and the condition assessment satisfactory, the dam has undergone modifications in 2009. Its spillway type is uncontrolled with a width of 21 feet, and the outlet gates consist of a slide (sluice gate). The dam's risk assessment is moderate, indicating a need for ongoing monitoring and risk management measures to ensure its continued safety and functionality for water resource management in the region.

Overall, Nada Dam serves as a critical infrastructure for water supply in Chelan County, Washington, playing a crucial role in water storage and management. With its historical significance dating back to the late 1930s, the dam remains a key component of the local water resource infrastructure, showcasing the intersection of engineering, environmental stewardship, and climate resilience in the region.

Years Modified

2009 - Other

Year Completed

1939

Dam Length

24

Dam Height

9

River Or Stream

UNNAMED TRIBUT. TO SNOW CREEK

Primary Dam Type

Buttress

Hydraulic Height

9

Drainage Area

1.59

Nid Storage

55

Structural Height

9

Outlet Gates

Slide (sluice gate)

Hazard Potential

Low

Foundations

Rock

Nid Height

9
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.