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Airport Rd over Nine Mile Slough

Harney County, Oregon · rated Good in the 2025 National Bridge Inventory

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

Airport Rd over Nine Mile Slough in Harney County, Oregon, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 7 (good condition) on the 0-9 scale.
It was built in 2022, making it 3 years old at the 2025 inventory.
It carries about 400 vehicles a day (traffic count year 2020).
Its listed owner is the county highway agency.
It is one of 65 of the 128 inventoried bridges in Harney County rated good (50.8%); 2 (1.6%) 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	Steel stringer or multi-beam girder
Length	about 32 ft
Location	000 Jct Or 78 Steens Hwy
NBI structure number	24143 C11500002
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
US 20 (hwy 007) over Silvies River	1999	2,834	Good
US 20 (hwy 007) over Willow Creek	1993	2,792	Fair
US 20 (hwy 007) over Poison Creek(susans Br)	1966	2,332	Good
US 20 (hwy 007) over Foley Slough	1999	2,332	Good
US 20 (hwy 007) over Silver Creek	1956	2,325	Fair
US 20 (hwy 007) over Miller Creek	2004	2,325	Good