Predecessor highways Interstate 69 in Michigan

map of central southern michigan in 1919 showing route of m-29

     concrete      gravel      water-bound macadam

the first major overland transportation corridors in future state of michigan indian trails. none of these followed path of modern i-69 however. state trunkline highway system created on may 13, 1913, act of michigan legislature; @ time, none of system s divisions corresponded modern i-69 either. in 1919, michigan state highway department (mshd) required signpost highway system first time, , state become second after wisconsin so. @ time, 2 different highways followed sections of modern i-69 corridor. original m-29 ran indiana state line north charlotte , turned northeasterly lansing. second highway m-21 flint east goodells, community west of port huron; highway extended port huron 1924.

on november 11, 1926, united states numbered highway system approved american association of state highway officials (aasho), , new us 27 replaced m-29 state line northward lansing. end of next year, m-78 extended charlotte north , east of lansing junction m-47 near pittsburg, north of modern i-69. section of m-78 north of lansing changed in 1929; segment dewitt pittsburg redesignated m-104, , m-78 rerouted along more southerly path through east lansing haslett. 1936, m-78 extended haslett way flint end @ m-21. first span of blue water bridge opened between port huron , point edward, ontario, in 1938.

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