US Bridges

Owyhee B485 over Owyhee Canal

Fair

Malheur County, Oregon · 3.8 MI W Owyhee JCT · Structure no. 45C208103600364

Built
1971
54 years old
Condition
Fair
inspected October 2023
Type
Channel Beam
Prestressed Concrete
Length
45 ft
1 main span
Daily traffic
312
2020 count
Owner
County
County Highway Agency

About this bridge

Owyhee B485 over Owyhee Canal is a prestressed concrete channel beam carrying Owyhee B485 over Owyhee Canal in Malheur County, Oregon. It was built in 1971, so it is 54 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 312 vehicles a day, roughly 10% of them trucks, projected to reach 362 by 2025. The structure is 45 ft (13.7 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesOwyhee B485
CrossesOwyhee Canal
Location3.8 MI W Owyhee JCT
RouteCounty Highway 0B485
CountyMalheur County
StateOregon
Coordinates43.7948, -117.1259
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31 US tons
Inventory rating18 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length45 ft (13.7 m)
Longest span43 ft (13.1 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic312 (2020)
Projected traffic362 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Owyhee B485 over Owyhee Canal built?

It was built in 1971, making it 54 years old in 2025.

What condition is Owyhee B485 over Owyhee Canal 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 October 2023.

How much traffic does Owyhee B485 over Owyhee Canal carry?

About 312 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Owyhee B485 over Owyhee Canal?

The structure is 45 ft (13.7 m) long with a longest span of 43 ft (13.1 m) and a deck 30 ft wide.

Who owns Owyhee B485 over Owyhee Canal?

It is owned by the County Highway Agency.