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M-46 over S Br Cass River

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

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

M-46 over S Br Cass River in Sanilac 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 2007, making it 18 years old at the 2025 inventory.
It carries about 3,484 vehicles a day (traffic count year 2007).
Its listed owner is the state highway agency.
It is one of 50 of the 170 inventoried bridges in Sanilac County rated good (29.4%); 25 (14.7%) 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 stringer or multi-beam girder
Length	about 135 ft
Location	2.0 Mi W of M-19
NBI structure number	000000000009477
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
M-90 over Mills Creek	2023	8,400	Good
M-90 over Black River	2023	8,400	Good
M-25 over Mill Creek	2016	7,775	Good
M-46 over Black River	1947	5,462	Poor
M-90 over Spring Creek	2000	5,001	Good
M-90 over W Br Mills Creek	2006	5,001	Good