Woods Reservoir Dam Reservoir Report
Last Updated: December 15, 2025
Woods Reservoir Dam, located in San Juan, Washington, was completed in 1972 and serves as a crucial infrastructure for irrigation purposes.
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Summary
This privately owned Earth dam stands at a hydraulic height of 20 feet and has a structural height of 16 feet. With a storage capacity of 245 acre-feet, the dam plays a vital role in managing water resources in the region, particularly for the Tr-False Bay river or stream.
The dam, managed by the Washington Dept of Ecology, has a low hazard potential and is currently not rated in terms of its condition assessment. While the last inspection date dates back to July 2001, the dam has state jurisdiction and is subject to state regulation, permitting, inspection, and enforcement. Although the dam has not been modified in recent years, it is important to note that emergency action preparedness and risk management measures are yet to be fully assessed and implemented.
Water resource and climate enthusiasts interested in Woods Reservoir Dam will find its location and design intriguing. The dam's primary purpose of irrigation underscores its significance for agricultural activities in the area. With a storage capacity of 245 acre-feet and a surface area of 25.5 acres, the dam effectively manages water flow and storage for the region. While the dam's condition and risk assessment require further evaluation, its role in water management and irrigation in the San Juan region cannot be understated.
Year Completed |
1972 |
River Or Stream |
Tr-False Bay |
Primary Dam Type |
Earth |
Surface Area |
25.5 |
Hydraulic Height |
20 |
Drainage Area |
0.2 |
Nid Storage |
245 |
Structural Height |
16 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Nooksack River At Ferndale
|
8730cfs |
Dungeness River Near Sequim
|
708cfs |
Samish River Near Burlington
|
596cfs |
Skagit River Near Mount Vernon
|
63500cfs |
Olsen Creek Near Bellingham
|
1cfs |
Carpenter Creek At N Shore Drive Nr Bellingham
|
1cfs |
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.
Woods Reservoir Dam
San Juan County