  1 3 1 ) ▁in ▁L odi . ▁A ▁further ▁extension ▁north ▁from ▁L odi ▁in ▁ 1 9 2 9 ▁or ▁ 1 9 3 0 ▁along ▁M - 1 3 1 ▁to ▁Man cel ona , ▁a ▁short ▁segment ▁of ▁M - 8 8 ▁and ▁north ▁to ▁US   3 1 ▁in ▁Char le vo ix . ▁The ▁southern ▁end ▁was ▁extended ▁to ▁US   1 6 ▁south ▁of ▁Low ell ▁by ▁ 1 9 3 1 . ▁A ▁section ▁of ▁the ▁northern ▁extension ▁was ▁marked ▁on ▁maps ▁through ▁ 1 9 3 3 ▁as ▁" under ▁construction ". ▁That ▁section ▁was ▁cancel led ▁in ▁favor ▁of ▁another ▁routing ▁near ▁Man cel ona . ▁A ▁short ▁by pass ▁of ▁Six ▁L akes ▁added ▁about ▁a ▁mile ▁to ▁the ▁length ▁of ▁the ▁road way ▁in ▁ 1 9 3 6 . ▁The ▁M - 1 3 1 ▁conc urrency ▁was ▁switched ▁to ▁a ▁US   1 3 1 ▁conc urrency ▁when ▁the ▁latter ▁was ▁extended ▁in ▁ 1 9 3 9 . ▁This ▁conc urrency ▁was ▁short ened ▁just ▁before ▁World ▁War ▁II ▁when ▁the ▁Michigan ▁State ▁Highway ▁Department ▁( MS HD ) ▁r er out ed ▁US   1 3 1 ▁along ▁a ▁new ▁road ▁between ▁South ▁Board man ▁and ▁K alk aska . ▁ ▁The ▁M SH D ▁completed ▁a ▁major ▁r er out ing ▁of ▁M - 6 6 ▁around ▁ 1 9 4 4 – 4 5 . ▁The ▁M - 1 4 ▁design ation ▁of ▁the