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Route 415 over Tahquamenon River

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

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

Route 415 over Tahquamenon River in Luce 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 1974, making it 51 years old at the 2025 inventory.
It carries about 40 vehicles a day (traffic count year 2016).
Its listed owner is the county highway agency.
It is one of 13 of the 28 inventoried bridges in Luce County rated fair (46.4%); 4 (14.3%) 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 86 ft
Location	2 Mi. N. Mc Millan
NBI structure number	000000000005917
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
M-28 over E Br Teaspoon Creek	1993	3,756	Fair
M-28 over W Br Sage River	2001	2,127	Fair
M-28 over E Br Sage River	1959	2,127	Fair
M-28 over E Br Fox River	1989	1,763	Fair
Dollarville Road over Teaspoon Creek	1951	1,700	Fair
County Rd 98 over Helmer Creek	2005	1,200	Good