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Or 39 (hwy 050) over Lost River

Klamath County, Oregon · rated Fair in the 2025 National Bridge Inventory

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

Or 39 (hwy 050) over Lost River in Klamath County, Oregon, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1941 and reconstructed in 1992, making it 84 years old at the 2025 inventory.
It carries about 5,002 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 139 of the 248 inventoried bridges in Klamath County rated fair (56.0%); 11 (4.4%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings


Structure	Continuous concrete tee beam
Length	about 120 ft
Location	043 Mi N Hwy 426 Jct
NBI structure number	02417 050 01221
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
Or 140 (hwy 020) over Usrs Canal	1930	20,461	Fair
Or 140 (hwy 020) over Link River	1931	19,357	Fair
Or 140 (hwy 020) over City St & UPRR	1957	19,357	Fair
Shasta Way over A Canal	1979	16,068	Good
S Side Bypass over UPRR	1986	11,928	Fair
S Side Bypass over BNSF & Klamath River	1986	11,850	Good