US Bridges

Or 39 (hwy 050) over Lost River

Fair

Klamath County, Oregon · 043 MI N HWY 426 JCT · Structure no. 02417 050 01221

Built
1941
84 years old, rebuilt 1992
Condition
Fair
inspected February 2023
Type
Tee Beam
Concrete Continuous
Length
120 ft
3 main spans
Daily traffic
5,002
2022 count
Owner
State
State Highway Agency

About this bridge

Or 39 (hwy 050) over Lost River is a concrete continuous tee beam carrying Or 39 (hwy 050) over Lost River in Klamath County, Oregon. It was built in 1941 and reconstructed in 1992, so it is 84 years old, older than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 5,002 vehicles a day, roughly 21% of them trucks, projected to reach 5,100 by 2042. The structure is 120 ft (36.6 m) long and 43 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesOr 39 (hwy 050)
CrossesLost River
Location043 MI N HWY 426 JCT
RouteState Highway 39
StateOregon
Coordinates42.04029, -121.62378
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating24.3 US tons
Inventory rating18.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length120 ft (36.6 m)
Longest span50 ft (15.2 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,002 (2022)
Projected traffic5,100 by 2042
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Or 39 (hwy 050) over Lost River built?

It was built in 1941, making it 84 years old in 2025. It was reconstructed in 1992.

What condition is Or 39 (hwy 050) over Lost River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in February 2023.

How much traffic does Or 39 (hwy 050) over Lost River carry?

About 5,002 vehicles per day (2022 count), of which roughly 21% are trucks.

How long is Or 39 (hwy 050) over Lost River?

The structure is 120 ft (36.6 m) long with a longest span of 50 ft (15.2 m) and a deck 43 ft wide.

Who owns Or 39 (hwy 050) over Lost River?

It is owned by the State Highway Agency.