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Rockriver Road over Rock River

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

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

Rockriver Road over Rock River in Alger 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 8 (very good condition) on the 0-9 scale.
It was built in 2007, making it 18 years old at the 2025 inventory.
It carries about 145 vehicles a day (traffic count year 2006).
Its listed owner is the county highway agency.
It is one of 16 of the 53 inventoried bridges in Alger County rated good (30.2%); 7 (13.2%) 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 60 ft
Location	1.1 Mi S of M-28
NBI structure number	000000000000058
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
M-28 over Anna River	1949	7,171	Fair
East Munising Ave over Anna River	1978	5,715	Fair
M-28 over Au Train River	1932	5,200	Fair
US-41 over Huber Creek	1987	3,609	Fair
M-28 over Sand River	1939	3,093	Fair
M-28 over Laughing Whitefish River	1939	3,093	Good