US Bridges

Quinaby Road over I-5 (hwy 1)

Fair

Marion County, Oregon · 030 MI N Salem Ncl · Structure no. 07852A001 26241

Built
1975
50 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
324 ft
2 main spans
Daily traffic
94,995
2022 count
Owner
State
State Highway Agency

About this bridge

Quinaby Road over I-5 (hwy 1) is a prestressed concrete continuous stringer/multi-beam or girder carrying Quinaby Road over I-5 (hwy 1) in Marion County, Oregon. It was built in 1975, so it is 50 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 94,995 vehicles a day, roughly 14% of them trucks, projected to reach 105,200 by 2042. The structure is 324 ft (98.8 m) long and 43 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesQuinaby Road
CrossesI-5 (hwy 1)
Location030 MI N Salem Ncl
RouteCounty Highway 0
CountyMarion County
StateOregon
Coordinates45.03506, -122.98061
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating23.6 US tons
Inventory rating18.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20
Structure length324 ft (98.8 m)
Longest span137 ft (41.8 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic94,995 (2022)
Projected traffic105,200 by 2042
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed6.2 mi (10 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$2.3 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was Quinaby Road over I-5 (hwy 1) built?

It was built in 1975, making it 50 years old in 2025.

What condition is Quinaby Road over I-5 (hwy 1) 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 August 2024.

How much traffic does Quinaby Road over I-5 (hwy 1) carry?

About 94,995 vehicles per day (2022 count), of which roughly 14% are trucks.

How long is Quinaby Road over I-5 (hwy 1)?

The structure is 324 ft (98.8 m) long with a longest span of 137 ft (41.8 m) and a deck 43 ft wide.

Who owns Quinaby Road over I-5 (hwy 1)?

It is owned by the State Highway Agency.