▁of ▁the ▁original ▁high ▁school , ▁located ▁on ▁Sh osh one ▁Street ▁next ▁to ▁the ▁T win ▁F alls ▁County ▁Cour th ouse , ▁occurred ▁in ▁February ▁ 1 9 1 2 . ▁ ▁The ▁current ▁T win ▁F alls ▁High ▁School ▁on ▁Fil er ▁Avenue ▁opened ▁in ▁September ▁ 1 9 5 4 . ▁The ▁original ▁high ▁school ▁building ▁became ▁T win ▁F alls ▁Junior ▁High ▁School ▁( now ▁O ' Le ary ▁Middle ▁School ). ▁The ▁original ▁building ▁was ▁condem ned ▁and ▁torn ▁down ▁in ▁the ▁early ▁ 1 9 8 0 s ▁after ▁O ' Le ary ▁moved ▁to ▁a ▁new ▁location ▁in ▁ 1 9 7 9 . ▁ ▁Athletics ▁Until ▁ 2 0 0 9 , ▁T F HS ▁was ▁among ▁the ▁largest ▁high ▁schools ▁in ▁the ▁state , ▁class ified ▁as ▁ 5 A ▁( en roll ment ▁over ▁ 1 , 2 8 0 ▁students ) ▁by ▁the ▁I HS AA . ▁With ▁the ▁opening ▁of ▁C any on ▁R idge ▁High ▁School ▁in ▁western ▁T win ▁F alls ▁in ▁August ▁ 2 0 0 9 , ▁both ▁schools ▁were ▁class ified ▁as ▁ 4 A ▁( four - year ▁en roll ment ▁between ▁ 6 4 0 ▁and ▁ 1 , 2 7 9 ). ▁A ▁c ros st own ▁rival ry ▁between ▁T F HS ▁and ▁CR HS ▁has ▁since ▁developed . ▁ ▁With ▁the ▁move ▁to ▁down ▁to ▁ 4 A ▁in ▁ 2 0 0 9 , ▁T F HS ▁also ▁changed