US Bridges

I-405 (hwy 061) CO over HWY 61 NB to HWY 1 NB

Fair

Multnomah County, Oregon · Et Fremont Intchge · Structure no. 08958H061 00388

Built
1973
52 years old
Condition
Fair
inspected October 2024
Type
Box Beam or Girders - Multiple
Steel Continuous
Length
1,040 ft
6 main spans
Daily traffic
103,251
2022 count
Owner
State
State Highway Agency

About this bridge

I-405 (hwy 061) CO over HWY 61 NB to HWY 1 NB is a steel continuous box beam or girders - multiple carrying I-405 (hwy 061) CO over HWY 61 NB to HWY 1 NB in Multnomah County, Oregon. It was built in 1973, so it is 52 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 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 103,251 vehicles a day, roughly 8% of them trucks, projected to reach 121,900 by 2042. The structure is 1,040 ft (317 m) long and 44 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesI-405 (hwy 061) CO
CrossesHWY 61 NB to HWY 1 NB
LocationEt Fremont Intchge
RouteInterstate 405
CountyMultnomah County
StateOregon
Coordinates45.54452, -122.67629
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating24.3 US tons
Inventory rating18.5 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length1,040 ft (317 m)
Longest span227 ft (69.2 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deck18 ft (5.5 m)

Traffic and service

Average daily traffic103,251 (2022)
Projected traffic121,900 by 2042
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed8.7 mi (14 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-405 (hwy 061) CO over HWY 61 NB to HWY 1 NB built?

It was built in 1973, making it 52 years old in 2025.

What condition is I-405 (hwy 061) CO over HWY 61 NB to HWY 1 NB 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 October 2024.

How much traffic does I-405 (hwy 061) CO over HWY 61 NB to HWY 1 NB carry?

About 103,251 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is I-405 (hwy 061) CO over HWY 61 NB to HWY 1 NB?

The structure is 1,040 ft (317 m) long with a longest span of 227 ft (69.2 m) and a deck 44 ft wide.

Who owns I-405 (hwy 061) CO over HWY 61 NB to HWY 1 NB?

It is owned by the State Highway Agency.