US Bridges

Illahee Frontagerd over I-5 (hwy 1)

Fair

Marion County, Oregon · 2.1 MI S of Salem · Structure no. 07939A001 24710

Built
1980
45 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
210 ft
2 main spans
Daily traffic
318
2022 count
Owner
State
State Highway Agency

About this bridge

Illahee Frontagerd over I-5 (hwy 1) is a prestressed concrete continuous stringer/multi-beam or girder carrying Illahee Frontagerd over I-5 (hwy 1) in Marion County, Oregon. It was built in 1980, so it is 45 years old, younger 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 318 vehicles a day, roughly 13% of them trucks, projected to reach 2,209 by 2030. The structure is 210 ft (64 m) long and 35 ft wide.

Location

Open in Google Maps
CarriesIllahee Frontagerd
CrossesI-5 (hwy 1)
Location2.1 MI S of Salem
RouteInterstate 5
CountyMarion County
StateOregon
Coordinates44.82553, -123.01603
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40.3 US tons
Inventory rating31.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length210 ft (64 m)
Longest span110 ft (33.5 m)
Deck width35 ft (10.6 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic318 (2022)
Projected traffic2,209 by 2030
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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$1.2 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was Illahee Frontagerd over I-5 (hwy 1) built?

It was built in 1980, making it 45 years old in 2025.

What condition is Illahee Frontagerd 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 December 2023.

How much traffic does Illahee Frontagerd over I-5 (hwy 1) carry?

About 318 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is Illahee Frontagerd over I-5 (hwy 1)?

The structure is 210 ft (64 m) long with a longest span of 110 ft (33.5 m) and a deck 35 ft wide.

Who owns Illahee Frontagerd over I-5 (hwy 1)?

It is owned by the State Highway Agency.