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Montgomery Road over S Br Cass River I/c Drn

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

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

Montgomery Road over S Br Cass River I/c Drn in Sanilac County, Michigan, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
It was built in 1977, making it 48 years old at the 2025 inventory.
It carries about 265 vehicles a day (traffic count year 2016).
Its listed owner is the county highway agency.
It is one of 95 of the 170 inventoried bridges in Sanilac County rated fair (55.9%); 25 (14.7%) 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	Prestressed concrete multiple box beam
Length	about 58 ft
Location	Sec 13 Marlette Twp
NBI structure number	000000000009641
Condition class	Fair

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