US Bridges

HWY 40 Capitol HWY over B-142 Semi-Viaduct

Fair

Multnomah County, Oregon · Semiviaduct 3 W of Barbur · Structure no. 08549 040 00647

Built
1959
66 years old
Condition
Fair
inspected September 2024
Type
Tee Beam
Concrete
Length
176 ft
7 main spans
Daily traffic
21,947
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

HWY 40 Capitol HWY over B-142 Semi-Viaduct is a concrete tee beam carrying HWY 40 Capitol HWY over B-142 Semi-Viaduct in Multnomah County, Oregon. It was built in 1959, so it is 66 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 21,947 vehicles a day, roughly 1% of them trucks, projected to reach 31,885 by 2025. The structure is 176 ft (53.6 m) long and 19 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesHWY 40 Capitol HWY
CrossesB-142 Semi-Viaduct
LocationSemiviaduct 3 W of Barbur
RouteCity Street 10
CountyMultnomah County
StateOregon
Coordinates45.48027, -122.68514
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment6: Equal to present minimum criteria
Operating rating39.2 US tons
Inventory rating30.3 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length176 ft (53.6 m)
Longest span25 ft (7.6 m)
Deck width19 ft (5.8 m)
Roadway width35 ft (10.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,947 (2020)
Projected traffic31,885 by 2025
Trucks1%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesOther
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$902,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was HWY 40 Capitol HWY over B-142 Semi-Viaduct built?

It was built in 1959, making it 66 years old in 2025.

What condition is HWY 40 Capitol HWY over B-142 Semi-Viaduct 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 September 2024.

How much traffic does HWY 40 Capitol HWY over B-142 Semi-Viaduct carry?

About 21,947 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is HWY 40 Capitol HWY over B-142 Semi-Viaduct?

The structure is 176 ft (53.6 m) long with a longest span of 25 ft (7.6 m) and a deck 19 ft wide.

Who owns HWY 40 Capitol HWY over B-142 Semi-Viaduct?

It is owned by the City or Municipal Highway Agency.