US Bridges

St. Louis Road over I-5 (hwy 1)

Fair

Marion County, Oregon · 030 MI S Woodburn Ncl · Structure no. 07847A001 26881

Built
1975
50 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
266 ft
2 main spans
Daily traffic
91,617
2022 count
Owner
State
State Highway Agency

About this bridge

St. Louis Road over I-5 (hwy 1) is a prestressed concrete continuous stringer/multi-beam or girder carrying St. Louis 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 91,617 vehicles a day, roughly 14% of them trucks, projected to reach 102,800 by 2042. The structure is 266 ft (81.1 m) long and 52 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesSt. Louis Road
CrossesI-5 (hwy 1)
Location030 MI S Woodburn Ncl
RouteCounty Highway 0
CountyMarion County
StateOregon
Coordinates45.11518, -122.91723
Functional classRural Minor 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 evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65 US tons
Inventory rating50 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length266 ft (81.1 m)
Longest span133 ft (40.5 m)
Deck width52 ft (15.7 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic91,617 (2022)
Projected traffic102,800 by 2042
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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 St. Louis Road over I-5 (hwy 1) built?

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

What condition is St. Louis 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 St. Louis Road over I-5 (hwy 1) carry?

About 91,617 vehicles per day (2022 count), of which roughly 14% are trucks.

How long is St. Louis Road over I-5 (hwy 1)?

The structure is 266 ft (81.1 m) long with a longest span of 133 ft (40.5 m) and a deck 52 ft wide.

Who owns St. Louis Road over I-5 (hwy 1)?

It is owned by the State Highway Agency.