Mid-Michigan Railroad
Reporting mark: MMRR
CSX - Muskegon River Bridge (Muskegon County, Michigan)
Built 1924Warren through truss with all verticals bridge over Muskegon River on Mid-Michigan RailroadOpen to traffic
GR - Grand River Bridge (Kent County, Michigan)
Built 1904Pratt through truss bridge over Grand River on Grand Rapids Eastern RR (formerly Pere Marquette RR)Open to traffic
MMRR - Pine River Bridge (Gratiot County, Michigan)
Deck plate girder bridge over Pine River on Mid-Michigan RailroadOpen to traffic