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M-37 over Mdot RR Corridor

Grand Traverse County, Michigan · rated Fair in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

M-37 over Mdot RR Corridor in Grand Traverse County, Michigan, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
It was built in 1965 and reconstructed in 1997, making it 60 years old at the 2025 inventory.
It carries about 16,500 vehicles a day (traffic count year 2024).
Its listed owner is the state highway agency.
It is one of 14 of the 33 inventoried bridges in Grand Traverse County rated fair (42.4%); 2 (6.1%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings


Structure	Steel stringer or multi-beam girder
Length	about 222 ft
Location	0.5 Mi S of US-31
NBI structure number	000000000003055
Condition class	Fair

Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.

Bridge	Built	Vehicles/day	Condition
Us-31\|m-37\|m-72\|gr over Boardman River	1951	26,650	Good
Three Mile Road over Mitchell Creek	2006	24,586	Good
S Airport Road over Boardman River	1977	21,860	Fair
Beitner Road over Boardman River	1980	19,628	Poor
S Airport Road over Boardman River	1961	18,938	Fair
Eighth Street over Boardman River	1974	15,609	Good