US Bridges

I-405 (hwy 061) CO over HWY 61 & Conn 4

Fair

Multnomah County, Oregon · 0.5 MI SW Port Cc · Structure no. 09254A061C00209

Built
1967
58 years old
Condition
Fair
inspected July 2023
Type
Frame
Concrete
Length
33 ft
1 main span
Daily traffic
32,652
2022 count
Owner
State
State Highway Agency

About this bridge

I-405 (hwy 061) CO over HWY 61 & Conn 4 is a concrete frame carrying I-405 (hwy 061) CO over HWY 61 & Conn 4 in Multnomah County, Oregon. It was built in 1967, so it is 58 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 5 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 32,652 vehicles a day, roughly 4% of them trucks, projected to reach 29,400 by 2030. The structure is 33 ft (10.1 m) long and 204 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-405 (hwy 061) CO
CrossesHWY 61 & Conn 4
Location0.5 MI SW Port Cc
RouteInterstate 405
CountyMultnomah County
StateOregon
Coordinates45.51573, -122.68913
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2023
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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.7 US tons
Inventory rating46.7 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length33 ft (10.1 m)
Longest span29 ft (8.8 m)
Deck width204 ft (62.2 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic32,652 (2022)
Projected traffic29,400 by 2030
Trucks4%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 & Conn 4 built?

It was built in 1967, making it 58 years old in 2025.

What condition is I-405 (hwy 061) CO over HWY 61 & Conn 4 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 2023.

How much traffic does I-405 (hwy 061) CO over HWY 61 & Conn 4 carry?

About 32,652 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is I-405 (hwy 061) CO over HWY 61 & Conn 4?

The structure is 33 ft (10.1 m) long with a longest span of 29 ft (8.8 m) and a deck 204 ft wide.

Who owns I-405 (hwy 061) CO over HWY 61 & Conn 4?

It is owned by the State Highway Agency.