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County Road 421 over Tahquamenon River

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

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

County Road 421 over Tahquamenon River in Luce County, Michigan, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 4 (poor condition) on the 0-9 scale.
It was built in 1967, making it 58 years old at the 2025 inventory.
It carries about 20 vehicles a day (traffic count year 2016).
Its listed owner is the county highway agency.
It is one of 4 of the 28 inventoried bridges in Luce County rated poor (14.3%); 4 (14.3%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings


Structure	Steel stringer or multi-beam girder
Length	about 23 ft
Location	Eagles Nest Camp
NBI structure number	000000000005924
Condition class	Poor

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