J.M. Johnson was president of Louisville Bridge and Iron Company for a time, but apparently began his own consulting engineering practice.
Eggner's Ferry Bridge
(Marshall County, Kentucky)Consulting Engineer, 1932Lost through truss bridge over Tennessee River on US 68/KY 80Replaced by a new bridge
South Cross Creeks Bridge
(Stewart County, Tennessee)Plans and specifications, 1902Abandoned Pratt through truss bridge over South Cross CreekAbandoned