US Bridges

I-5 (hwy 1) NB over Santiam Overflow No. 6

Fair

Linn County, Oregon · 057 MI N of Albany Ncl · Structure no. 18350 001 23985

Built
2001
24 years old
Condition
Fair
inspected February 2023
Type
Slab
Concrete Continuous
Length
302 ft
8 main spans
Daily traffic
33,361
2022 count
Owner
State
State Highway Agency

About this bridge

I-5 (hwy 1) NB over Santiam Overflow No. 6 is a concrete continuous slab carrying I-5 (hwy 1) NB over Santiam Overflow No. 6 in Linn County, Oregon. It was built in 2001, so it is 24 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 33,361 vehicles a day, roughly 15% of them trucks, projected to reach 36,200 by 2042. The structure is 302 ft (92 m) long and 50 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. 6
Location057 MI N of Albany Ncl
RouteInterstate 5
CountyLinn County
StateOregon
Coordinates44.72516, -123.05369
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.2 US tons
Inventory rating36.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans8
Design loadHL 93
Structure length302 ft (92 m)
Longest span39 ft (11.9 m)
Deck width50 ft (15.2 m)
Roadway width47 ft (14.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic33,361 (2022)
Projected traffic36,200 by 2042
Trucks15%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesRelief for waterway
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. 6 built?

It was built in 2001, making it 24 years old in 2025.

What condition is I-5 (hwy 1) NB over Santiam Overflow No. 6 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. 6 carry?

About 33,361 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is I-5 (hwy 1) NB over Santiam Overflow No. 6?

The structure is 302 ft (92 m) long with a longest span of 39 ft (11.9 m) and a deck 50 ft wide.

Who owns I-5 (hwy 1) NB over Santiam Overflow No. 6?

It is owned by the State Highway Agency.