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CR 489(RED Oak Rd) over Au Sable River

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

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

CR 489(RED Oak Rd) over Au Sable River in Oscoda 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 1959, making it 66 years old at the 2025 inventory.
It carries about 1,540 vehicles a day (traffic count year 2005).
Its listed owner is the county highway agency.
It is one of 7 of the 15 inventoried bridges in Oscoda County rated fair (46.7%); 3 (20.0%) 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 129 ft
Location	Sec 2-3 Big Creek Twp
NBI structure number	000000000008667
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
M-33\|m-72\|n Mount over Au Sable River	1984	8,950	Fair
M-72\|cripps Rd over E Br Big Creek	1960	2,656	Fair
Deeter Road over West Br Big Creek	2001	2,100	Good
M-72\|park Rd over W Br Big Creek	1957	2,064	Fair
Mckinley Rd(c 600) over Perry Creek	2003	1,440	Good
Mckinley Rd(c 600) over Commins Creek	2003	1,440	Fair