, ▁in ▁the ▁administrative ▁region ▁of ▁S ag uen ay - L ac - Saint - Jean , ▁Quebec , ▁Canada . ▁ ▁The ▁Cha udi ère ▁River ▁flows ▁in ▁the ▁town ships ▁of ▁V im ont , ▁M ance , ▁M ign ault ▁and ▁A ig rem ont . ▁Forest ry ▁is ▁the ▁main ▁economic ▁activity ▁of ▁this ▁valley ; ▁recre ational ▁tour ism ▁activities , ▁second . ▁ ▁The ▁route ▁ 1 6 7 ▁( n orth w ester ly ) ▁connecting ▁Ch ib oug am au ▁to ▁Saint - F é lic ien , ▁Quebec ▁intersect s ▁the ▁lower ▁( i . e ., ▁sou ther ly ) ▁section ▁of ▁the ▁river ▁Cha udi ère . ▁The ▁Canadian ▁National ▁Railway ▁runs ▁along ▁this ▁road . ▁The ▁forest ▁road ▁R 0 2 1 0 ▁serves ▁the ▁upper ▁part ▁of ▁the ▁river ▁that ▁it ▁cut s ▁near ▁the ▁mouth ▁of ▁the ▁head ▁lake ; ▁it ▁also ▁serves ▁the ▁eastern ▁part ▁of ▁this ▁valley . ▁ ▁The ▁surface ▁of ▁the ▁Cha udi ère ▁River ▁is ▁usually ▁fro zen ▁from ▁early ▁November ▁to ▁mid - May , ▁however , ▁safe ▁ice ▁circul ation ▁is ▁generally ▁from ▁mid - Nov ember ▁to ▁mid - A pril . ▁ ▁Geography ▁ ▁Top onym y ▁ ▁The ▁name ▁" R iv ière ▁Cha udi ère " ▁was ▁made ▁official ▁on ▁December ▁ 5 , ▁ 1 9 6 8 ▁at ▁the ▁Commission ▁de ▁to pon ym ie ▁du ▁Québec , ▁that ▁is , ▁at ▁its ▁creation .