US Bridges

C-675 over Malheur River

Fair

Malheur County, Oregon · 015 M S Inter HWY 20 26 · Structure no. 15627A067500146

Built
1973
52 years old
Condition
Fair
inspected October 2023
Type
Slab
Prestressed Concrete
Length
144 ft
3 main spans
Daily traffic
234
2020 count
Owner
County
County Highway Agency

About this bridge

C-675 over Malheur River is a prestressed concrete slab carrying C-675 over Malheur River in Malheur County, Oregon. It was built in 1973, so it is 52 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 234 vehicles a day, roughly 20% of them trucks, projected to reach 279 by 2025. The structure is 144 ft (43.9 m) long and 28 ft wide. If it were closed, the detour would be 9.3 mi (15 km).

Location

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CarriesC-675
CrossesMalheur River
Location015 M S Inter HWY 20 26
RouteCounty Highway 0B495
CountyMalheur County
StateOregon
Coordinates43.91994, -117.30564
Functional classRural Minor 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.
Superstructure7 GoodSome minor problems.
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
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
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 rating31.7 US tons
Inventory rating24.3 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans3
Design loadHS 20
Structure length144 ft (43.9 m)
Longest span50 ft (15.2 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic234 (2020)
Projected traffic279 by 2025
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.3 mi (15 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 C-675 over Malheur River built?

It was built in 1973, making it 52 years old in 2025.

What condition is C-675 over Malheur 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 October 2023.

How much traffic does C-675 over Malheur River carry?

About 234 vehicles per day (2020 count), of which roughly 20% are trucks.

How long is C-675 over Malheur River?

The structure is 144 ft (43.9 m) long with a longest span of 50 ft (15.2 m) and a deck 28 ft wide.

Who owns C-675 over Malheur River?

It is owned by the County Highway Agency.