, ▁so ▁the ▁soldiers ▁built ▁a ▁permanent ▁camp ▁at op ▁Council ▁Bl uff , ▁and ▁renamed ▁it ▁Fort ▁At kin son . ▁Just ▁east ▁of ▁present - day ▁Fort ▁Cal h oun , ▁Neb r aska , ▁it ▁was ▁abandoned ▁in ▁ 1 8 2 7 . ▁ ▁Fail ure ▁of ▁the ▁expedition ▁Due ▁to ▁its ▁financial ▁costs ▁and ▁general ▁lack ▁of ▁first ▁season ▁results , ▁the ▁expedition ▁became ▁a ▁res ounding ▁failure ▁upon ▁st alling ▁at ▁Fort ▁Lisa . ▁Cong r essional ▁economy ▁measures ▁and ▁difficulties ▁in ▁supp lying ▁such ▁distant ▁out posts ▁prevent ed ▁the ▁completion ▁of ▁the ▁expedition ▁and ▁the ▁force ▁was ▁halt ed ▁there , ▁well ▁down stream ▁of ▁its ▁intended ▁destination ▁at ▁the ▁mouth ▁of ▁the ▁Y ellow stone ▁River . ▁In ▁May ▁ 1 8 2 0 , ▁Long ▁returned ▁to ▁" Engine er ▁C anton ment " ▁with ▁his ▁own ▁orders ▁from ▁the ▁Secretary ▁of ▁War ▁to ▁ce ase ▁work ▁along ▁the ▁Missouri ▁and ▁turn ▁instead ▁to ▁expl oring ▁the ▁Pl atte ▁River ▁and ▁its ▁sources . ▁The ▁expedition ▁left ▁their ▁winter ▁qu arters ▁on ▁June ▁ 6 , ▁ 1 8 2 0 . ▁Colonel ▁At kin son ▁led ▁a ▁further ▁expedition ▁to ▁reach ▁the ▁Y ellow stone ▁River ▁in ▁ 1 8 2 5 . ▁ ▁Fin an cial ▁issues ▁and ▁over - ext rav ag ant ▁planning ▁At ▁about ▁the ▁time ▁that ▁the ▁Y ellow stone ▁expedition ▁depart ed ▁from ▁St . ▁Louis , ▁the ▁Pan ic ▁of ▁ 1 8 1 9