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M-37 over Manistee River

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

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

M-37 over Manistee River in Wexford County, Michigan, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1934 and reconstructed in 1994, making it 91 years old at the 2025 inventory.
It carries about 5,896 vehicles a day (traffic count year 2007).
Its listed owner is the state highway agency.
It is one of 43 of the 64 inventoried bridges in Wexford County rated fair (67.2%); 5 (7.8%) 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	Prestressed concrete stringer or multi-beam girder
Length	about 118 ft
Location	0.9 Mi N of Sherman
NBI structure number	000000000012537
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
E 36 Rd over US-131 NB	1997	77,777	Fair
US-131 Bl\|mitchell over Clam River	1935	23,406	Fair
M-115 over Cadillac Canal	1957	12,589	Fair
Mackinaw Trail Hwy over US-131 Nb\|m-55 EB	1966	12,310	Fair
Chestnut over Clam River	1968	12,000	Poor
M-55\|e 38 Rd over US-131 NB	1997	10,400	Fair