US Bridges

NE Alderwood Road over B-113 X Columbia Slough

Fair

Multnomah County, Oregon · At N E Cornfoot Road · Structure no. 25B113000000000

Built
1989
36 years old
Condition
Fair
inspected July 2024
Type
Slab
Prestressed Concrete
Length
48 ft
1 main span
Daily traffic
6,741
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

NE Alderwood Road over B-113 X Columbia Slough is a prestressed concrete slab carrying NE Alderwood Road over B-113 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 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 6,741 vehicles a day, roughly 25% of them trucks, projected to reach 7,491 by 2025. The structure is 48 ft (14.6 m) long and 44 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesNE Alderwood Road
CrossesB-113 X Columbia Slough
LocationAt N E Cornfoot Road
RouteCity Street 9937
CountyMultnomah County
StateOregon
Coordinates45.57215, -122.58518
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79 US tons
Inventory rating47 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 (13.4 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,741 (2020)
Projected traffic7,491 by 2025
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$246,000
NavigationNo navigation control on waterway

Frequently asked questions

When was NE Alderwood Road over B-113 X Columbia Slough built?

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

What condition is NE Alderwood Road over B-113 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 Alderwood Road over B-113 X Columbia Slough carry?

About 6,741 vehicles per day (2020 count), of which roughly 25% are trucks.

How long is NE Alderwood Road over B-113 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 Alderwood Road over B-113 X Columbia Slough?

It is owned by the City or Municipal Highway Agency.