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M-43 over Mud Creek

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

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

M-43 over Mud Creek in Eaton 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 1949, making it 76 years old at the 2025 inventory.
It carries about 3,660 vehicles a day (traffic count year 2007).
Its listed owner is the state highway agency.
It is one of 128 of the 202 inventoried bridges in Eaton County rated fair (63.4%); 11 (5.4%) 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 33 ft
Location	2.3 Mi W of Sunfield
NBI structure number	000000000002225
Condition class	Fair

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