US Bridges

I-5 (hwy 1) SB over Calapooia Oflow

Good

Linn County, Oregon · 170 MI N Lane-Linn Line · Structure no. 08235S001 22004

Built
1958
67 years old, rebuilt 1987
Condition
Good
inspected December 2024
Type
Tee Beam
Concrete Continuous
Length
189 ft
5 main spans
Daily traffic
21,606
2022 count
Owner
State
State Highway Agency

About this bridge

I-5 (hwy 1) SB over Calapooia Oflow is a concrete continuous tee beam carrying I-5 (hwy 1) SB over Calapooia Oflow in Linn County, Oregon. It was built in 1958 and reconstructed in 1987, 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 21,606 vehicles a day, roughly 25% of them trucks, projected to reach 24,900 by 2042. The structure is 189 ft (57.6 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-5 (hwy 1) SB
CrossesCalapooia Oflow
Location170 MI N Lane-Linn Line
RouteInterstate 5
CountyLinn County
StateOregon
Coordinates44.43956, -123.06164
Functional classRural Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
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 geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.4 US tons
Inventory rating27.1 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length189 ft (57.6 m)
Longest span39 ft (11.9 m)
Deck width45 ft (13.6 m)
Roadway width42 ft (12.8 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) SB over Calapooia Oflow built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 1987.

What condition is I-5 (hwy 1) SB over Calapooia Oflow in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2024.

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

The structure is 189 ft (57.6 m) long with a longest span of 39 ft (11.9 m) and a deck 45 ft wide.

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

It is owned by the State Highway Agency.