From the record
“The Columbia River Quarantine Station, now known as the Knappton Cove Heritage Center, is a historic site in Knappton, Washington. The station provided fumigation and quarantine services to maritime vessels at the port on the Columbia River from 1899 to 1938, and is the sole remaining quarantine station on the West Coast of the United States as all others were burned for fear of contamination.”
Wikipedia article Columbia River Quarantine Station, CC BY-SA 4.0.
One of 20 National Register listings published here for Pacific County · listed in 1980 · category: Building · built in 1899.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service
