Home › Michigan › Gratiot County › State Road over Drain #473

State Road over Drain #473

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

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

State Road over Drain #473 in Gratiot County, Michigan, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 7 (good condition) on the 0-9 scale.
It was built in 2014, making it 11 years old at the 2025 inventory.
It carries about 660 vehicles a day (traffic count year 2012).
Its listed owner is the county highway agency.
It is one of 64 of the 167 inventoried bridges in Gratiot County rated good (38.3%); 22 (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 single box beam
Length	about 47 ft
Location	Sec 30 Washington Twp
NBI structure number	000000000003165
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
US-127 NB over US-127 Br	1961	15,400	Fair
US-127 SB over US-127 Br	1961	15,400	Fair
M-46 & US-127BR over US-127	1961	11,219	Poor
US-127 NB over Maple River	1988	10,831	Fair
US-127 SB over Maple River	1955	10,831	Good
US-127 Br over Pine River	1928	10,432	Fair