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M-66 over Wanadoga Creek

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

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

M-66 over Wanadoga Creek in Calhoun 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 2012, making it 13 years old at the 2025 inventory.
It carries about 8,121 vehicles a day (traffic count year 2011).
Its listed owner is the state highway agency.
It is one of 43 of the 213 inventoried bridges in Calhoun County rated good (20.2%); 37 (17.4%) 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 single box beam
Length	about 65 ft
Location	3.2 Mi SW of Barry Col
NBI structure number	000000000001198
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
I-94 Bl & M-37 over I-94	2015	121,987	Fair
I-94 EB over Riverside Drive	2009	25,840	Fair
I-94 WB over Riverside Drive	2009	25,840	Fair
I-194 over Kalamazoo River	1966	24,600	Fair
I-194 over Gtw RR	1966	24,600	Fair
I-194 over Conrail (abn)	1966	24,600	Fair