US Bridges

HWY 064 (I-205 Nb) over Columbia Sl & Alderwood

Fair

Multnomah County, Oregon · 2.2 MI S Ore-Wash Line · Structure no. 16055 064 02434

Built
1980
45 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
311 ft
3 main spans
Daily traffic
74,468
2022 count
Owner
State
State Highway Agency

About this bridge

HWY 064 (I-205 Nb) over Columbia Sl & Alderwood is a prestressed concrete stringer/multi-beam or girder carrying HWY 064 (I-205 Nb) over Columbia Sl & Alderwood in Multnomah County, Oregon. It was built in 1980, so it is 45 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 74,468 vehicles a day, roughly 6% of them trucks, projected to reach 101,800 by 2042. The structure is 311 ft (94.8 m) long and 70 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesHWY 064 (I-205 Nb)
CrossesColumbia Sl & Alderwood
Location2.2 MI S Ore-Wash Line
RouteInterstate 205
CountyMultnomah County
StateOregon
Coordinates45.56678, -122.55501
Functional classUrban Principal Arterial - Interstate

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length311 ft (94.8 m)
Longest span120 ft (36.6 m)
Deck width70 ft (21.2 m)
Roadway width66 ft (20.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic74,468 (2022)
Projected traffic101,800 by 2042
Trucks6%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed14.3 mi (23 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 HWY 064 (I-205 Nb) over Columbia Sl & Alderwood built?

It was built in 1980, making it 45 years old in 2025.

What condition is HWY 064 (I-205 Nb) over Columbia Sl & Alderwood 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 HWY 064 (I-205 Nb) over Columbia Sl & Alderwood carry?

About 74,468 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is HWY 064 (I-205 Nb) over Columbia Sl & Alderwood?

The structure is 311 ft (94.8 m) long with a longest span of 120 ft (36.6 m) and a deck 70 ft wide.

Who owns HWY 064 (I-205 Nb) over Columbia Sl & Alderwood?

It is owned by the State Highway Agency.