US Bridges

SW Alder over HWY 61

Fair

Multnomah County, Oregon · 0.1 MI N of SW Yamhill · Structure no. 09282A061 00212

Built
1968
57 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
165 ft
2 main spans
Daily traffic
81,503
2020 count
Owner
State
State Highway Agency

About this bridge

SW Alder over HWY 61 is a steel stringer/multi-beam or girder carrying SW Alder over HWY 61 in Multnomah County, Oregon. It was built in 1968, so it is 57 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 81,503 vehicles a day, roughly 11% of them trucks, projected to reach 117,600 by 2040. The structure is 165 ft (50.3 m) long and 60 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesSW Alder
CrossesHWY 61
Location0.1 MI N of SW Yamhill
RouteCity Street 0
CountyMultnomah County
StateOregon
Coordinates45.52168, -122.68546
Functional classUrban Minor Arterial

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
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 geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating29.3 US tons
Inventory rating22.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length165 ft (50.3 m)
Longest span84 ft (25.6 m)
Deck width60 ft (18.3 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic81,503 (2020)
Projected traffic117,600 by 2040
Trucks11%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.7 mi (6 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$1.6 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was SW Alder over HWY 61 built?

It was built in 1968, making it 57 years old in 2025.

What condition is SW Alder 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 Alder over HWY 61 carry?

About 81,503 vehicles per day (2020 count), of which roughly 11% are trucks.

How long is SW Alder over HWY 61?

The structure is 165 ft (50.3 m) long with a longest span of 84 ft (25.6 m) and a deck 60 ft wide.

Who owns SW Alder over HWY 61?

It is owned by the State Highway Agency.