Ferndale Aerated Sewage Lagoon No 3 Reservoir Report
Last Updated: December 15, 2025
Located within the Ferndale City Limits in Washington, the Ferndale Aerated Sewage Lagoon No 3 is a crucial water resource facility that plays a vital role in treating wastewater.
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Summary
Owned by the local government and regulated by the Washington Department of Ecology, this aerated sewage lagoon was completed in 1986 and has a hydraulic height of 10 feet and a structural height of 17 feet. With a storage capacity of 45 acre-feet and a surface area of 4 acres, this lagoon serves a significant purpose in managing and treating sewage in the region.
The Ferndale Aerated Sewage Lagoon No 3 is designed as an earth dam with rockfill core and soil foundation. With a high hazard potential, this facility is inspected regularly to ensure its structural integrity and compliance with regulations. The last inspection conducted in October 2020 deemed the dam's condition as satisfactory. With a drainage area of 0.01 square miles and a maximum discharge capacity of 12 cubic feet per second, this sewage lagoon serves as a critical infrastructure for maintaining water quality in the Tr-Nooksack River-Offstream.
In the event of emergencies, the facility's emergency action plan (EAP) is crucial for preparedness and response. While the details of the EAP's last revision and compliance with guidelines are not provided, the Ferndale Aerated Sewage Lagoon No 3 remains a key component of the water management infrastructure in Whatcom County, Washington. With its significant storage capacity, efficient treatment processes, and regulatory oversight, this facility exemplifies the importance of sustainable water resource management in mitigating the impacts of climate change on water quality and availability.
Year Completed |
1986 |
Dam Length |
1820 |
River Or Stream |
Tr-Nooksack River-Offstream |
Primary Dam Type |
Earth |
Surface Area |
4 |
Hydraulic Height |
10 |
Drainage Area |
0.01 |
Nid Storage |
45 |
Structural Height |
17 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
17 |
Seasonal Comparison
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Nearby Streamflow Levels
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.
Ferndale Aerated Sewage Lagoon No 3
East Wiser Lake Road 145, Lynden