▁the ▁practice ▁of ▁naming ▁ge ographic ▁features ▁after ▁prominent ▁persons ▁who ▁somehow ▁had ▁been ▁connected ▁with ▁the ▁expedition , ▁particularly ▁the ▁President ▁and ▁members ▁of ▁his ▁cabinet , ▁( v iz ▁Jefferson , ▁Mad ison , ▁and ▁Gall atin ▁R ivers ) ▁or ▁attributes ▁of ▁President ▁Jefferson ▁( v iz . ▁Phil anth ropy , ▁Philosoph y , ▁and ▁Wis dom ▁R ivers ). ▁In ▁addition , ▁as ▁far ▁as ▁can ▁be ▁determined , ▁a ▁ge ographic ▁feature ▁was ▁named ▁for ▁every ▁Corps ▁member , ▁including ▁Se aman , ▁Lewis ' s ▁New found land ▁dog . ▁ ▁In ▁ 1 8 0 6 , ▁on ▁the ▁return ▁leg ▁of ▁the ▁expedition ▁down ▁the ▁Y ellow stone ▁River , ▁Clark ▁also ▁named ▁another ▁ge ographical ▁feature ▁for ▁York , ▁" Y ork ' s ▁D ry ▁Creek ", ▁a ▁trib ut ary ▁of ▁the ▁Y ellow stone ▁River ▁in ▁C uster ▁County , ▁Mont ana . ▁ ▁This ▁name ▁did ▁not ▁stick , ▁however , ▁and ▁the ▁cre ek ▁became ▁known ▁as ▁" C uster ▁Creek ". ▁ ▁Official ▁Rec ogn ition ▁of ▁nom en cl ature ▁" Y ork s ▁Islands " ▁ ▁Though ▁the ▁name ▁for ▁" Y ork s ▁ 8 ▁Islands " ▁appears ▁on ▁Clark ' s ▁ 1 8 0 5 ▁maps ▁of ▁the ▁exped itions ▁travel ▁along ▁the ▁Missouri ▁for ▁July ▁ 2 4 , ▁ 1 8 0 5 , ▁the ▁ge ographical ▁design ation ▁for ▁" Y ork s ▁Islands " ▁was ▁not ▁officially ▁confirmed