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I-75 NB over Lake State RR

Crawford County, Michigan · rated Poor in the 2025 National Bridge Inventory

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

I-75 NB over Lake State RR in Crawford County, Michigan, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 3 (serious condition) on the 0-9 scale.
It was built in 1961 and reconstructed in 1991, making it 64 years old at the 2025 inventory.
It carries about 5,877 vehicles a day (traffic count year 2007).
Its listed owner is the state highway agency.
It is one of 6 of the 55 inventoried bridges in Crawford County rated poor (10.9%); 6 (10.9%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings


Structure	Steel stringer or multi-beam girder
Length	about 141 ft
Location	0.5 Mi S of M-72
NBI structure number	000000000002033
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
I-75bl\|m-72\|n Jame over Au Sable River	1935	13,375	Fair
M-72\|m-93 over Au Sable River	1993	11,731	Fair
I-75 SB over S Grayling Rd	1970	11,000	Fair
I-75 NB over S Grayling Rd	1970	11,000	Fair
I-75 NB over E Br Au Sable River	1961	9,772	Fair
I-75 NB over Lewiston Grade Road	1961	9,772	Fair