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M-231 over Grand River

Ottawa County, Michigan · rated Good in the 2025 National Bridge Inventory

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

M-231 over Grand River in Ottawa County, Michigan, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
It was built in 2013, making it 12 years old at the 2025 inventory.
It carries about 18,700 vehicles a day (traffic count year 2010).
Its listed owner is the state highway agency.
It is one of 79 of the 253 inventoried bridges in Ottawa County rated good (31.2%); 23 (9.1%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Continuous steel stringer or multi-beam girder
Length	about 3,708 ft
Location	4.5 Mi N of M-45
NBI structure number	000000000013460
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
Taft Rd over US-31	1958	281,500	Fair
US-31 over Grand River M-104 Conn	1960	66,750	Fair
US-31 over Gtw RR & M-104	1959	44,375	Fair
US-31 over 3RD St (m-104)	1958	44,375	Fair
I-96 over Br of Sand Creek	1961	36,338	Good
I-96 EB over Deer Creek	1958	36,000	Fair