US Bridges

SW Vista Ave over B-41 Semi-Viaduct

FairPosted for load

Multnomah County, Oregon · 1 Blk S of Montgomery DR · Structure no. 25B41 000 00098

Built
1914
111 years old
Condition
Fair
inspected May 2024
Type
Slab
Concrete Continuous
Length
331 ft
24 main spans
Daily traffic
8,888
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

SW Vista Ave over B-41 Semi-Viaduct is a concrete continuous slab carrying SW Vista Ave over B-41 Semi-Viaduct in Multnomah County, Oregon. It was built in 1914, so it is 111 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 8,888 vehicles a day, roughly 1% of them trucks, projected to reach 9,777 by 2025. The structure is 331 ft (100.9 m) long and 25 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSW Vista Ave
CrossesB-41 Semi-Viaduct
Location1 Blk S of Montgomery DR
RouteCity Street 9317
CountyMultnomah County
StateOregon
Coordinates45.51472, -122.69653
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment6: Equal to present minimum criteria
Operating rating14.7 US tons
Inventory rating11.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans24
Design loadH 20
Structure length331 ft (100.9 m)
Longest span14 ft (4.3 m)
Deck width25 ft (7.6 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,888 (2020)
Projected traffic9,777 by 2025
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesOther
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SW Vista Ave over B-41 Semi-Viaduct built?

It was built in 1914, making it 111 years old in 2025.

What condition is SW Vista Ave over B-41 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 May 2024.

How much traffic does SW Vista Ave over B-41 Semi-Viaduct carry?

About 8,888 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is SW Vista Ave over B-41 Semi-Viaduct?

The structure is 331 ft (100.9 m) long with a longest span of 14 ft (4.3 m) and a deck 25 ft wide.

Who owns SW Vista Ave over B-41 Semi-Viaduct?

It is owned by the City or Municipal Highway Agency.