US Bridges

Columbia C-860 over Owyhee Canal

Fair

Malheur County, Oregon · 003MI W JCT Clark Blvd · Structure no. 45C219086000233

Built
1964
61 years old
Condition
Fair
inspected October 2023
Type
Channel Beam
Prestressed Concrete
Length
31 ft
1 main span
Daily traffic
259
2020 count
Owner
County
County Highway Agency

About this bridge

Columbia C-860 over Owyhee Canal is a prestressed concrete channel beam carrying Columbia C-860 over Owyhee Canal in Malheur County, Oregon. It was built in 1964, so it is 61 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 259 vehicles a day, roughly 10% of them trucks, projected to reach 304 by 2025. The structure is 31 ft (9.4 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesColumbia C-860
CrossesOwyhee Canal
Location003MI W JCT Clark Blvd
RouteCounty Highway C0860
CountyMalheur County
StateOregon
Coordinates43.89488, -117.02921
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 evaluation4: Meets minimum tolerable limits to be 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 rating16.8 US tons
Inventory rating12.9 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length31 ft (9.4 m)
Longest span30 ft (9.1 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic259 (2020)
Projected traffic304 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Columbia C-860 over Owyhee Canal built?

It was built in 1964, making it 61 years old in 2025.

What condition is Columbia C-860 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 Columbia C-860 over Owyhee Canal carry?

About 259 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Columbia C-860 over Owyhee Canal?

The structure is 31 ft (9.4 m) long with a longest span of 30 ft (9.1 m) and a deck 32 ft wide.

Who owns Columbia C-860 over Owyhee Canal?

It is owned by the County Highway Agency.