US Bridges

Or 201 (hwy 450) over Owyhee River

Good

Malheur County, Oregon · 8.7 Mi. S. Jct. US 20/26 · Structure no. 01747B450 00873

Built
1985
40 years old
Condition
Good
inspected November 2023
Type
Slab
Prestressed Concrete
Length
339 ft
7 main spans
Daily traffic
1,475
2022 count
Owner
State
State Highway Agency

About this bridge

Or 201 (hwy 450) over Owyhee River is a prestressed concrete slab carrying Or 201 (hwy 450) over Owyhee River in Malheur County, Oregon. It was built in 1985, so it is 40 years old, younger than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,475 vehicles a day, roughly 31% of them trucks, projected to reach 1,800 by 2042. The structure is 339 ft (103.4 m) long and 40 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesOr 201 (hwy 450)
CrossesOwyhee River
Location8.7 Mi. S. Jct. US 20/26
RouteState Highway 201
CountyMalheur County
StateOregon
Coordinates43.784, -117.0555
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.4 US tons
Inventory rating43.5 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans7
Design loadHS 25 or greater
Structure length339 ft (103.4 m)
Longest span48 ft (14.6 m)
Deck width40 ft (12.2 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,475 (2022)
Projected traffic1,800 by 2042
Trucks31%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

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 201 (hwy 450) over Owyhee River built?

It was built in 1985, making it 40 years old in 2025.

What condition is Or 201 (hwy 450) over Owyhee River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2023.

How much traffic does Or 201 (hwy 450) over Owyhee River carry?

About 1,475 vehicles per day (2022 count), of which roughly 31% are trucks.

How long is Or 201 (hwy 450) over Owyhee River?

The structure is 339 ft (103.4 m) long with a longest span of 48 ft (14.6 m) and a deck 40 ft wide.

Who owns Or 201 (hwy 450) over Owyhee River?

It is owned by the State Highway Agency.