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120TH Avenue over Gun River Drain Ext

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

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

120TH Avenue over Gun River Drain Ext in Allegan 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 2004, making it 21 years old at the 2025 inventory.
It carries about 120 vehicles a day (traffic count year 2020).
Its listed owner is the county highway agency.
It is one of 60 of the 245 inventoried bridges in Allegan County rated good (24.5%); 41 (16.7%) 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 80 ft
Location	Martin Twp Sec 12-13
NBI structure number	000000000000278
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
US-131 NB over Kalamazoo River	1996	27,941	Fair
US-131 SB over Kalamazoo River	1996	27,941	Fair
US-131 NB over Grand Elk RR	1960	27,941	Fair
US-131 SB over Grand Elk RR	1960	27,941	Poor
I-196 E & US-31 N over Kalamazoo River	1964	24,400	Fair
M-89 (allegan St) over Kalamazoo Riv Mill Race	2012	21,300	Fair