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SR-185 over Stillwater River

Miami County, Ohio · rated Good in the 2025 National Bridge Inventory

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

SR-185 over Stillwater River in Miami County, Ohio, 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 1963 and reconstructed in 2008, making it 62 years old at the 2025 inventory.
It carries about 2,844 vehicles a day (traffic count year 2015).
Its listed owner is the state highway agency.
It is one of 218 of the 312 inventoried bridges in Miami County rated good (69.9%); 18 (5.8%) 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	Continuous steel stringer or multi-beam girder
Length	about 238 ft
Location	1.6MI.E. of Darke County
NBI structure number	5503485
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
Ir 75 over Ext of Boone Creek	2001	66,840	Good
Ir-75 over Clayton Ext. of Peters C	1957	66,840	Good
Ir-75 over W. Branch of Peters Cree	1957	66,840	Good
Ir-75 over Branch Great Miami River	1957	54,110	Fair
Ir-75 over County Ditch	1957	54,110	Fair
Ir-75 over Howell Extension Ditch	1957	54,110	Good