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M-66 over N Br Chippewa River

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

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

M-66 over N Br Chippewa River in Mecosta County, Michigan, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
It was built in 1927 and reconstructed in 1999, making it 98 years old at the 2025 inventory.
It carries about 2,294 vehicles a day (traffic count year 2007).
Its listed owner is the state highway agency.
It is one of 47 of the 80 inventoried bridges in Mecosta County rated fair (58.8%); 3 (3.8%) 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	Steel stringer or multi-beam girder
Length	about 79 ft
Location	1.0 Mi N of Barryton
NBI structure number	000000000006755
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US-131 SB over 3 Mile Road	1979	20,300	Good
US-131 NB over 3 Mile Road	1979	20,300	Fair
US-131 SB over Little Muskegon River	1979	20,200	Fair
US-131 NB over Little Muskegon River	1979	20,200	Fair
US-131 SB over Muskegon River	1983	18,000	Fair
US-131 NB over Muskegon River	1982	18,000	Fair