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Purpose:
The City of Port Angeles currently obtains potable water from a Ranney collector along the Elwha River about three miles upstream of the river’s mouth. Upon removal of the Elwha dam and Glines Canyon dam, sediments that have accumulated in the two reservoirs since the dams were built will be released downstream.
Because the Ranney collector draws both groundwater and surface water, the city’s current water system does not comply with drinking water standards, and this would be exacerbated through removal of the dams and the release of sediments. The new Port Angeles Water Treatment Plant (PAWTP) will allow the city to comply with water quality standards during dam removal and into the future.
Design:
The PAWTP is designed to provide up to 10.6 million gallons of treated water daily to the City’s water distribution system. The majority of water during dam removal will come from the Ranney collector, or the Elwha Water Treatment Plant when necessary.
Primary elements of the facility include an Actiflo/filter/clearwell/administrative building, a concrete backwash holding and recycle storage basin, and a concrete sludge drying bed with a sand layer for drying.
Location:
The PAWTP is being constructed on the same property as the site of the old landfill which now serves as the city’s transfer station.
Useful Links:
Learn more about the PAWTP construction contract.
Read more about the PAWTP in the Elwha River Ecosystem Restoration Implementation Final SEIS (PDF).
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