US Bridges

Hy 61SB Conn HY1SB over Water Ave

FairPosted for load

Multnomah County, Oregon · W. Marquam Interchange · Structure no. 08591E061 00053

Built
1966
59 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
305 ft
1 main span
Daily traffic
42,482
2022 count
Owner
State
State Highway Agency

About this bridge

Hy 61SB Conn HY1SB over Water Ave is a steel stringer/multi-beam or girder carrying Hy 61SB Conn HY1SB over Water Ave in Multnomah County, Oregon. It was built in 1966, so it is 59 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. Its operating status is: posted for load restriction.

It carries about 42,482 vehicles a day, roughly 6% of them trucks, projected to reach 45,550 by 2042. The structure is 305 ft (93 m) long and 37 ft wide.

CarriesHy 61SB Conn HY1SB
CrossesWater Ave
LocationW. Marquam Interchange
RouteInterstate 405
StateOregon
Coordinates45.50498, -122.67582
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating23.9 US tons
Inventory rating18.5 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+4 approach)
Design loadHS 20
Structure length305 ft (93 m)
Longest span87 ft (26.4 m)
Deck width37 ft (11.3 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deck19 ft (5.8 m)

Traffic and service

Average daily traffic42,482 (2022)
Projected traffic45,550 by 2042
Trucks6%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 Hy 61SB Conn HY1SB over Water Ave built?

It was built in 1966, making it 59 years old in 2025.

What condition is Hy 61SB Conn HY1SB over Water Ave 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 March 2023.

How much traffic does Hy 61SB Conn HY1SB over Water Ave carry?

About 42,482 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is Hy 61SB Conn HY1SB over Water Ave?

The structure is 305 ft (93 m) long with a longest span of 87 ft (26.4 m) and a deck 37 ft wide.

Who owns Hy 61SB Conn HY1SB over Water Ave?

It is owned by the State Highway Agency.