US Bridges

NE 105th Ave over B-115 X Columbia Slough

Fair

Multnomah County, Oregon · NE 105th at NE Clark ST · Structure no. 16056 000000000

Built
1977
48 years old
Condition
Fair
inspected July 2024
Type
Slab
Prestressed Concrete
Length
113 ft
3 main spans
Daily traffic
4,862
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

NE 105th Ave over B-115 X Columbia Slough is a prestressed concrete slab carrying NE 105th Ave over B-115 X Columbia Slough in Multnomah County, Oregon. It was built in 1977, so it is 48 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 4,862 vehicles a day, roughly 10% of them trucks, projected to reach 5,362 by 2025. The structure is 113 ft (34.4 m) long and 45 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesNE 105th Ave
CrossesB-115 X Columbia Slough
LocationNE 105th at NE Clark ST
RouteCity Street C0000
CountyMultnomah County
StateOregon
Coordinates45.56669, -122.5543
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
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 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 rating51.8 US tons
Inventory rating40 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length113 ft (34.4 m)
Longest span48 ft (14.6 m)
Deck width45 ft (13.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,862 (2020)
Projected traffic5,362 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed0.6 mi (1 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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was NE 105th Ave over B-115 X Columbia Slough built?

It was built in 1977, making it 48 years old in 2025.

What condition is NE 105th Ave over B-115 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 105th Ave over B-115 X Columbia Slough carry?

About 4,862 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is NE 105th Ave over B-115 X Columbia Slough?

The structure is 113 ft (34.4 m) long with a longest span of 48 ft (14.6 m) and a deck 45 ft wide.

Who owns NE 105th Ave over B-115 X Columbia Slough?

It is owned by the City or Municipal Highway Agency.