▁County . ▁It ▁joins ▁the ▁Rock ▁River ▁in ▁the ▁town ▁of ▁F ult on , ▁approximately ▁ ▁north west ▁of ▁Jan es ville . ▁ ▁The ▁U . S . ▁Board ▁on ▁Geographic ▁Names ▁( U SB GN ) ▁issued ▁a ▁decision ▁clar ifying ▁" Y ah ara ▁River " ▁as ▁the ▁stream ' s ▁name ▁in ▁ 1 9 0 3 . ▁ ▁According ▁to ▁the ▁Geographic ▁Names ▁Information ▁System , ▁it ▁has ▁also ▁been ▁known ▁histor ically ▁as ▁" Cat fish ▁River " ▁( S au k ▁" My an - me k ", ▁Pot aw atom i ▁" Go os ke ha wn " ▁[ G ish k zh ig wen ], ▁and ▁Ho - Ch unk ▁" G ah ara " ▁[ how į ́ ǧ era ]). ▁The ▁USB GN ' s ▁ 1 9 0 3 ▁investigation ▁noted ▁that ▁the ▁name ▁" Cat fish ▁River " ▁was ▁in ▁w ides p read ▁use ▁in ▁Rock ▁County ▁at ▁that ▁time , ▁and ▁that ▁" Y ah ara ▁River " ▁was ▁more ▁commonly ▁used ▁in ▁D ane ▁County . ▁ ▁During ▁World ▁War ▁II , ▁a ▁U . S . ▁Navy ▁gas oline ▁tank er , ▁the ▁USS ▁Y ah ara ▁( A O G - 3 7 ), ▁was ▁named ▁after ▁the ▁river . ▁ ▁Et ym ology ▁The ▁river ' s ▁name ▁comes ▁from ▁the ▁river ' s ▁Ho - Ch unk ▁name ▁" m ą ą ’ ii ▁y ah ara ", ▁meaning ▁' cat fish