US Bridges

I-5 (hwy 1) NB over Calapooia Oflow

Fair

Linn County, Oregon · 145 MI N Lane-Linn Line · Structure no. 08238N001 21785

Built
1958
67 years old
Condition
Fair
inspected December 2024
Type
Slab
Concrete Continuous
Length
75 ft
3 main spans
Daily traffic
21,606
2022 count
Owner
State
State Highway Agency

About this bridge

I-5 (hwy 1) NB over Calapooia Oflow is a concrete continuous slab carrying I-5 (hwy 1) NB over Calapooia Oflow in Linn County, Oregon. It was built in 1958, so it is 67 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 21,606 vehicles a day, roughly 25% of them trucks, projected to reach 24,900 by 2042. The structure is 75 ft (22.9 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-5 (hwy 1) NB
CrossesCalapooia Oflow
Location145 MI N Lane-Linn Line
RouteInterstate 5
CountyLinn County
StateOregon
Coordinates44.40745, -123.06115
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65 US tons
Inventory rating39 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length75 ft (22.9 m)
Longest span28 ft (8.5 m)
Deck width42 ft (12.9 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,606 (2022)
Projected traffic24,900 by 2042
Trucks25%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 Calapooia Oflow built?

It was built in 1958, making it 67 years old in 2025.

What condition is I-5 (hwy 1) NB over Calapooia Oflow 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 2024.

How much traffic does I-5 (hwy 1) NB over Calapooia Oflow carry?

About 21,606 vehicles per day (2022 count), of which roughly 25% are trucks.

How long is I-5 (hwy 1) NB over Calapooia Oflow?

The structure is 75 ft (22.9 m) long with a longest span of 28 ft (8.5 m) and a deck 42 ft wide.

Who owns I-5 (hwy 1) NB over Calapooia Oflow?

It is owned by the State Highway Agency.