US Bridges

Butte RD B493 over Malheur River (butte)

Fair

Malheur County, Oregon · 014 M N Inter HWY 20 26 · Structure no. 15566A088500031

Built
1974
51 years old
Condition
Fair
inspected October 2023
Type
Slab
Prestressed Concrete
Length
141 ft
3 main spans
Daily traffic
335
2020 count
Owner
County
County Highway Agency

About this bridge

Butte RD B493 over Malheur River (butte) is a prestressed concrete slab carrying Butte RD B493 over Malheur River (butte) in Malheur County, Oregon. It was built in 1974, so it is 51 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 335 vehicles a day, roughly 10% of them trucks, projected to reach 385 by 2025. The structure is 141 ft (43 m) long and 30 ft wide. If it were closed, the detour would be 5.6 mi (9 km).

Location

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CarriesButte RD B493
CrossesMalheur River (butte)
Location014 M N Inter HWY 20 26
RouteCounty Highway 0B493
CountyMalheur County
StateOregon
Coordinates44.00661, -117.08626
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
ScourFoundations stable; scour within limits of footing or piles
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 rating53.9 US tons
Inventory rating41.4 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans3
Design loadHS 20
Structure length141 ft (43 m)
Longest span60 ft (18.3 m)
Deck width30 ft (9.1 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic335 (2020)
Projected traffic385 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5.6 mi (9 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 Butte RD B493 over Malheur River (butte) built?

It was built in 1974, making it 51 years old in 2025.

What condition is Butte RD B493 over Malheur River (butte) 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 Butte RD B493 over Malheur River (butte) carry?

About 335 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Butte RD B493 over Malheur River (butte)?

The structure is 141 ft (43 m) long with a longest span of 60 ft (18.3 m) and a deck 30 ft wide.

Who owns Butte RD B493 over Malheur River (butte)?

It is owned by the County Highway Agency.