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US-31 NB over US-31 Br Colby Rd

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

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

US-31 NB over US-31 Br Colby Rd in Muskegon 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 1963, making it 62 years old at the 2025 inventory.
It carries about 9,754 vehicles a day (traffic count year 2007).
Its listed owner is the state highway agency.
It is one of 99 of the 143 inventoried bridges in Muskegon County rated fair (69.2%); 16 (11.2%) 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 127 ft
Location	S Jct US-31BR
NBI structure number	000000000007604
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 over I-96	1959	62,644	Fair
US-31 NB over Mi Shore RR & Laketon Av	1960	32,065	Fair
US-31 NB over Black Creek	1959	31,322	Fair
US-31 SB over Black Creek	1949	31,322	Fair
I-96 over Hile Rd	1961	31,000	Fair
I-96 EB over Airline Road	1961	29,245	Fair