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Three Mile Road over Munuscong River

Mackinac County, Michigan · rated Good in the 2025 National Bridge Inventory

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

Three Mile Road over Munuscong River in Mackinac County, Michigan, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
It was built in 1978, making it 47 years old at the 2025 inventory.
It carries about 40 vehicles a day (traffic count year 2015).
Its listed owner is the county highway agency.
It is one of 17 of the 63 inventoried bridges in Mackinac County rated good (27.0%); 10 (15.9%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Prestressed concrete multiple box beam
Length	about 111 ft
Location	9.2MI N of Hessel and M-1
NBI structure number	000000000005987
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
Us-2\|i-75 Bl over I-75 NB	1957	7,550	Fair
US-2 over Cut River	1947	4,450	Fair
US-2 over Brevort River	2019	4,400	Good
I-75 SB over Carp River	1964	4,400	Fair
I-75 SB over Mackinac Trail	1963	4,400	Fair
I-75 Bl over I-75 NB	1960	4,350	Fair