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M-50 over Little Thornapple River

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

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

M-50 over Little Thornapple River in Eaton 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 2,842 vehicles a day (traffic count year 2013).
Its listed owner is the state highway agency.
It is one of 63 of the 202 inventoried bridges in Eaton County rated good (31.2%); 11 (5.4%) 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	Prestressed concrete multiple box beam
Length	about 87 ft
Location	6.4 Mi NW of Charlotte
NBI structure number	000000000002229
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
I-96 WB over Grand Riv & Billwood Hwy	2023	47,900	Good
I-96 EB over M-43	1962	31,250	Fair
I-96 WB over M-43	1962	31,250	Fair
Otto Road over I-69	1989	27,800	Fair
I-96 EB over Grand River	1962	27,100	Fair
I-96 WB over Grand River	1962	27,100	Fair