US Bridges

I-5 (hwy 1) NB over Santiam Overflow No. 2

Fair

Marion County, Oregon · 7.2 MI N of Albany · Structure no. 17351 001 24135

Built
1994
31 years old
Condition
Fair
inspected February 2023
Type
Tee Beam
Concrete Continuous
Length
234 ft
6 main spans
Daily traffic
33,486
2022 count
Owner
State
State Highway Agency

About this bridge

I-5 (hwy 1) NB over Santiam Overflow No. 2 is a concrete continuous tee beam carrying I-5 (hwy 1) NB over Santiam Overflow No. 2 in Marion County, Oregon. It was built in 1994, so it is 31 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 5 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 33,486 vehicles a day, roughly 15% of them trucks, projected to reach 36,050 by 2042. The structure is 234 ft (71.3 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 Overflow No. 2
Location7.2 MI N of Albany
RouteInterstate 5
CountyMarion County
StateOregon
Coordinates44.74674, -123.05155
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be 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 rating23.6 US tons
Inventory rating18.2 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 25 or greater
Structure length234 ft (71.3 m)
Longest span39 ft (11.9 m)
Deck width63 ft (19.1 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic33,486 (2022)
Projected traffic36,050 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
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-5 (hwy 1) NB over Santiam Overflow No. 2 built?

It was built in 1994, making it 31 years old in 2025.

What condition is I-5 (hwy 1) NB over Santiam Overflow No. 2 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 Overflow No. 2 carry?

About 33,486 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is I-5 (hwy 1) NB over Santiam Overflow No. 2?

The structure is 234 ft (71.3 m) long with a longest span of 39 ft (11.9 m) and a deck 63 ft wide.

Who owns I-5 (hwy 1) NB over Santiam Overflow No. 2?

It is owned by the State Highway Agency.