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M-116 over Big Sable River

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

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

M-116 over Big Sable 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 superstructure, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1990, making it 35 years old at the 2025 inventory.
It carries about 901 vehicles a day (traffic count year 2013).
Its listed owner is the state 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 125 ft
Location	5.0 Mi N of Ludington
NBI structure number	000000000006632
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