US Bridges

SW 1st Ave over HWY 61

Fair

Multnomah County, Oregon · 0.2 MI N of Water Ave · Structure no. 09154 061 00071

Built
1964
61 years old
Condition
Fair
inspected July 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
215 ft
3 main spans
Daily traffic
71,649
2020 count
Owner
State
State Highway Agency

About this bridge

SW 1st Ave over HWY 61 is a concrete continuous box beam or girders - multiple carrying SW 1st Ave over HWY 61 in Multnomah County, Oregon. It was built in 1964, so it is 61 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 71,649 vehicles a day, roughly 11% of them trucks, projected to reach 102,100 by 2040. The structure is 215 ft (65.6 m) long and 89 ft wide. If it were closed, the detour would be 4.3 mi (7 km).

Location

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CarriesSW 1st Ave
CrossesHWY 61
Location0.2 MI N of Water Ave
RouteCity Street 0
CountyMultnomah County
StateOregon
Coordinates45.50556, -122.67873
Functional classUrban Collector

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 inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating16.8 US tons
Inventory rating13.2 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length215 ft (65.6 m)
Longest span81 ft (24.8 m)
Deck width89 ft (27.1 m)
Roadway width69 ft (21 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic71,649 (2020)
Projected traffic102,100 by 2040
Trucks11%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed4.3 mi (7 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$3.2 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was SW 1st Ave over HWY 61 built?

It was built in 1964, making it 61 years old in 2025.

What condition is SW 1st Ave over HWY 61 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 SW 1st Ave over HWY 61 carry?

About 71,649 vehicles per day (2020 count), of which roughly 11% are trucks.

How long is SW 1st Ave over HWY 61?

The structure is 215 ft (65.6 m) long with a longest span of 81 ft (24.8 m) and a deck 89 ft wide.

Who owns SW 1st Ave over HWY 61?

It is owned by the State Highway Agency.