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Birch Run Road over Flint River

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

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

Birch Run Road over Flint River in Saginaw 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 6 (satisfactory condition) on the 0-9 scale.
It was built in 1978, making it 47 years old at the 2025 inventory.
It carries about 3,400 vehicles a day (traffic count year 2018).
Its listed owner is the county highway agency.
It is one of 165 of the 315 inventoried bridges in Saginaw County rated fair (52.4%); 58 (18.4%) 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	Continuous steel stringer or multi-beam girder
Length	about 219 ft
Location	0.1 Mi E of Seymour Road
NBI structure number	000000000009273
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
I-75 NB over Cass River	1961	56,192	Good
I-75 US-10 over CSX RR	1961	47,480	Fair
I-75 US-10 over CSX RR	1958	46,000	Fair
I-75 SB over CSX RR	1958	38,000	Fair
I-75 NB over CSX RR	2021	32,900	Good
I-75 SB over CSX RR	2021	32,900	Fair