US Bridges

I-5 (hwy 1) NB over Santiam River

Fair

Marion County, Oregon · 065 MI N of Albany Ncl · Structure no. 17318 001 24066

Built
1995
30 years old
Condition
Fair
inspected February 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
860 ft
4 main spans
Daily traffic
33,446
2022 count
Owner
State
State Highway Agency

About this bridge

I-5 (hwy 1) NB over Santiam River is a prestressed concrete continuous box beam or girders - multiple carrying I-5 (hwy 1) NB over Santiam River in Marion County, Oregon. It was built in 1995, so it is 30 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 33,446 vehicles a day, roughly 15% of them trucks, projected to reach 36,150 by 2042. The structure is 860 ft (262.1 m) long and 63 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesI-5 (hwy 1) NB
CrossesSantiam River
Location065 MI N of Albany Ncl
RouteInterstate 5
CountyMarion County
StateOregon
Coordinates44.7374, -123.05257
Functional classRural Principal Arterial - Interstate

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.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating33.2 US tons
Inventory rating25.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 25 or greater
Structure length860 ft (262.1 m)
Longest span240 ft (73.2 m)
Deck width63 ft (19.1 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic33,446 (2022)
Projected traffic36,150 by 2042
Trucks15%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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$4.4 million
NavigationNo navigation control on waterway

Frequently asked questions

When was I-5 (hwy 1) NB over Santiam River built?

It was built in 1995, making it 30 years old in 2025.

What condition is I-5 (hwy 1) NB over Santiam River 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 February 2023.

How much traffic does I-5 (hwy 1) NB over Santiam River carry?

About 33,446 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is I-5 (hwy 1) NB over Santiam River?

The structure is 860 ft (262.1 m) long with a longest span of 240 ft (73.2 m) and a deck 63 ft wide.

Who owns I-5 (hwy 1) NB over Santiam River?

It is owned by the State Highway Agency.