US Bridges

NE 55th Ave over B-112 X Columbia Slough

Fair

Multnomah County, Oregon · At N E Cornfoot Road · Structure no. 25B112000000000

Built
1989
36 years old
Condition
Fair
inspected July 2024
Type
Slab
Prestressed Concrete
Length
48 ft
1 main span
Daily traffic
1,389
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

NE 55th Ave over B-112 X Columbia Slough is a prestressed concrete slab carrying NE 55th Ave over B-112 X Columbia Slough in Multnomah County, Oregon. It was built in 1989, so it is 36 years old, younger 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.

It carries about 1,389 vehicles a day, roughly 25% of them trucks, projected to reach 1,532 by 2025. The structure is 48 ft (14.6 m) long and 44 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesNE 55th Ave
CrossesB-112 X Columbia Slough
LocationAt N E Cornfoot Road
RouteCity Street C0000
CountyMultnomah County
StateOregon
Coordinates45.57617, -122.60649
Functional classUrban Local

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.
Superstructure8 Very GoodNo problems noted.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71 US tons
Inventory rating42 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length48 ft (14.6 m)
Longest span45 ft (13.7 m)
Deck width44 ft (13.5 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,389 (2020)
Projected traffic1,532 by 2025
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed123.7 mi (199 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was NE 55th Ave over B-112 X Columbia Slough built?

It was built in 1989, making it 36 years old in 2025.

What condition is NE 55th Ave over B-112 X Columbia Slough 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 July 2024.

How much traffic does NE 55th Ave over B-112 X Columbia Slough carry?

About 1,389 vehicles per day (2020 count), of which roughly 25% are trucks.

How long is NE 55th Ave over B-112 X Columbia Slough?

The structure is 48 ft (14.6 m) long with a longest span of 45 ft (13.7 m) and a deck 44 ft wide.

Who owns NE 55th Ave over B-112 X Columbia Slough?

It is owned by the City or Municipal Highway Agency.