1 5 ▁to ▁ 1 9 2 9 , ▁the ▁USS ▁Con cord ▁was ▁mo ored ▁at ▁Kn app ton ▁to ▁provide ▁lod ging . ▁ ▁During ▁its ▁first ▁year ▁of ▁operation , ▁Columbia ▁River ▁Qu ar antine ▁Station ▁screen ed ▁ 6 , 1 2 0 ▁people ▁from ▁ 9 7 ▁sail ing ▁vessels ▁and ▁ 3 5 ▁steam ▁vessels . ▁ ▁The ▁Sunday ▁Oregon ian ▁described ▁the ▁station ▁in ▁ 1 9 2 1 : ▁ ▁Before ▁any ▁vessel ▁coming ▁from ▁a ▁foreign ▁port ▁can ▁dis charge ▁or ▁load ▁cargo ▁in ▁the ▁Columbia ▁River ▁it ▁must ▁pass ▁quar antine ▁at ▁Ast oria . ▁The ▁' E ll is ▁Island ' ▁for ▁this ▁district ▁is ▁situated ▁on ▁the ▁Washington ▁side ▁of ▁the ▁river , ▁near ▁Kn app ton ; ▁and ▁consists ▁of ▁a ▁dock , ▁dis in fect ing ▁building ▁and ▁app li ances , ▁qu arters , ▁hospital , ▁det ention ▁qu arters , ▁etc . ▁... Thanks ▁to ▁the ▁vig il ance ▁of ▁the ▁quar antine ▁on ▁the ▁Columbia ▁River ▁our ▁c ites ▁have ▁yet ▁to ▁experience ▁the ▁pl ague . ▁ ▁During ▁the ▁ 1 9 2 0 s , ▁the ▁number ▁of ▁imm igr ants ▁decre ased ▁and ▁new ▁methods ▁of ▁dis in fect ing ▁ships ▁while ▁at ▁anchor ▁reduced ▁the ▁need ▁for ▁the ▁quar antine ▁station . ▁The ▁Columbia ▁River ▁Qu ar antine ▁Station ▁was ▁ph ased ▁out ▁in ▁ 1 9 3 8 . ▁ ▁Later ▁uses ▁ ▁For ▁a ▁short ▁time ▁after ▁ 1 9