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Or 78 (hwy 442) over Silvies Slough (1ST Br)

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

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

Or 78 (hwy 442) over Silvies Slough (1ST Br) 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 deck, rated 8 (very good condition) on the 0-9 scale.
It was built in 2010, making it 15 years old at the 2025 inventory.
It carries about 1,858 vehicles a day (traffic count year 2022).
Its listed owner is the state 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

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