▁Fl at head ▁County ▁at ▁ ▁( 4 8 . 0 6 5 2 1 4 , ▁- 1 1 4 . 0 8 1 7 0 0 ), ▁at ▁the ▁north ▁end ▁of ▁Fl at head ▁Lake . ▁The ▁western ▁edge ▁of ▁the ▁CD P ▁is ▁the ▁Fl at head ▁River , ▁the ▁primary ▁in flow ▁of ▁the ▁lake . ▁The ▁Sw an ▁River ▁flows ▁into ▁Fl at head ▁Lake ▁from ▁the ▁east , ▁entering ▁the ▁lake ▁at ▁the ▁center ▁of ▁town . ▁The ▁CD P ▁extends ▁south ▁to ▁the ▁Lake ▁County ▁line ; ▁east ▁to ▁M ud ▁Lake , ▁M ud ▁Creek , ▁and ▁the ▁north - s outh ▁part ▁of ▁the ▁Sw an ▁River ; ▁and ▁north wards ▁to ▁the ▁roads ▁north ▁of ▁E cho ▁Lake . ▁ ▁K alis p ell ▁is ▁ ▁to ▁the ▁north west , ▁via ▁Mont ana ▁Highway ▁ 3 5 , ▁Mont ana ▁Highway ▁ 8 2 , ▁and ▁U . S . ▁Route ▁ 9 3 . ▁Highway ▁ 3 5 ▁runs ▁through ▁the ▁center ▁of ▁Big f ork ▁and ▁proceed s ▁south ▁along ▁the ▁eastern ▁shore ▁of ▁Fl at head ▁Lake , ▁rejo ining ▁US ▁ 9 3 ▁near ▁Pol son . ▁ ▁According ▁to ▁the ▁United ▁States ▁Census ▁Bureau , ▁the ▁Big f ork ▁CD P ▁has ▁a ▁total ▁area ▁of ▁, ▁of ▁which ▁ ▁is ▁land ▁and ▁, ▁or ▁ 1 6 . 2 5 %, ▁is ▁water . ▁ ▁Dem ograph ics ▁As ▁of ▁the ▁census ▁of ▁ 2