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Custer Road over Big Sauble River

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

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

Custer Road over Big Sauble River in Mason 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 6 (satisfactory condition) on the 0-9 scale.
It was built in 1981, making it 44 years old at the 2025 inventory.
It carries about 707 vehicles a day (traffic count year 2020).
Its listed owner is the county highway agency.
It is one of 41 of the 66 inventoried bridges in Mason County rated fair (62.1%); 4 (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	Prestressed concrete multiple box beam
Length	about 56 ft
Location	1.0 Mi N of Freesoil
NBI structure number	000000000006665
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
Old US-31 over CSX RR	1935	11,200	Good
Old US-31 over Durham Creek	1925	8,600	Fair
Old US-31 over Pere Marquette River	1925	7,076	Fair
Old US-31 over Pere Marquette River	1924	6,828	Fair
US-31 over S Br Lincoln River	1992	6,578	Fair
US-31 over N Br Lincoln River	1992	6,578	Fair