US Bridges

Jefferson C-843 over Owyhee Canal

Fair

Malheur County, Oregon · 004 S Inter With FAS B485 · Structure no. 45C201084300039

Built
1960
65 years old
Condition
Fair
inspected October 2023
Type
Channel Beam
Prestressed Concrete
Length
27 ft
1 main span
Daily traffic
83
2020 count
Owner
County
County Highway Agency

About this bridge

Jefferson C-843 over Owyhee Canal is a prestressed concrete channel beam carrying Jefferson C-843 over Owyhee Canal in Malheur County, Oregon. It was built in 1960, so it is 65 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 83 vehicles a day, roughly 10% of them trucks, projected to reach 93 by 2025. The structure is 27 ft (8.2 m) long and 26 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesJefferson C-843
CrossesOwyhee Canal
Location004 S Inter With FAS B485
RouteCounty Highway C0843
CountyMalheur County
StateOregon
Coordinates43.789, -117.0954
Functional classRural Local

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating31.3 US tons
Inventory rating24.1 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length27 ft (8.2 m)
Longest span25 ft (7.6 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic83 (2020)
Projected traffic93 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Jefferson C-843 over Owyhee Canal built?

It was built in 1960, making it 65 years old in 2025.

What condition is Jefferson C-843 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 Jefferson C-843 over Owyhee Canal carry?

About 83 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Jefferson C-843 over Owyhee Canal?

The structure is 27 ft (8.2 m) long with a longest span of 25 ft (7.6 m) and a deck 26 ft wide.

Who owns Jefferson C-843 over Owyhee Canal?

It is owned by the County Highway Agency.