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Dolph Rd over Muskegon River

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

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

Dolph Rd over Muskegon River in Missaukee 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 9 (excellent condition) on the 0-9 scale.
It was built in 2023, making it 2 years old at the 2025 inventory.
It carries about 78 vehicles a day (traffic count year 2007).
Its listed owner is the county highway agency.
It is one of 20 of the 39 inventoried bridges in Missaukee County rated good (51.3%); 4 (10.3%) 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

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

Bridge	Built	Vehicles/day	Condition
M-55\|w Watergate R over Clam River	1973	5,113	Fair
M-55\|e Houghton La over W Br Muskegon River	1931	4,338	Fair
M-55\|e Houghton La over Muskegon River	1935	4,338	Fair
M-66\|w Stoney Corn over N Br Clam River	1933	4,081	Fair
M-66 over Clam River	1929	2,696	Fair
M-66\|s Burkett Rd over Middle Br Clam River	1929	2,466	Fair