US Bridges

I-405 (hwy 061)CON over 61 NB Conn to HWY 1 SB

Fair

Multnomah County, Oregon · E Fremont Intrchge · Structure no. 08958D061 00352

Built
1973
52 years old
Condition
Fair
inspected October 2024
Type
Box Beam or Girders - Multiple
Steel Continuous
Length
1,578 ft
7 main spans
Daily traffic
51,625
2022 count
Owner
State
State Highway Agency

About this bridge

I-405 (hwy 061)CON over 61 NB Conn to HWY 1 SB is a steel continuous box beam or girders - multiple carrying I-405 (hwy 061)CON over 61 NB Conn to HWY 1 SB 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 51,625 vehicles a day, roughly 8% of them trucks, projected to reach 60,950 by 2042. The structure is 1,578 ft (481 m) long and 30 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesI-405 (hwy 061)CON
Crosses61 NB Conn to HWY 1 SB
LocationE Fremont Intrchge
RouteInterstate 405
CountyMultnomah County
StateOregon
Coordinates45.5432, -122.6755
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating29.7 US tons
Inventory rating22.8 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans7 (+5 approach)
Design loadHS 20
Structure length1,578 ft (481 m)
Longest span160 ft (48.8 m)
Deck width30 ft (9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deck18 ft (5.5 m)

Traffic and service

Average daily traffic51,625 (2022)
Projected traffic60,950 by 2042
Trucks8%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed6.2 mi (10 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)CON over 61 NB Conn to HWY 1 SB built?

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

What condition is I-405 (hwy 061)CON over 61 NB Conn to HWY 1 SB 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)CON over 61 NB Conn to HWY 1 SB carry?

About 51,625 vehicles per day (2022 count), of which roughly 8% are trucks.

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

The structure is 1,578 ft (481 m) long with a longest span of 160 ft (48.8 m) and a deck 30 ft wide.

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

It is owned by the State Highway Agency.