US Bridges

I-5 (hwy 1) SB over Courtney Creek Oflow

Fair

Linn County, Oregon · 138 MI N Lane-Linn Line · Structure no. 08240S001 21720

Built
1959
66 years old
Condition
Fair
inspected December 2024
Type
Tee Beam
Concrete Continuous
Length
84 ft
3 main spans
Daily traffic
21,606
2022 count
Owner
State
State Highway Agency

About this bridge

I-5 (hwy 1) SB over Courtney Creek Oflow is a concrete continuous tee beam carrying I-5 (hwy 1) SB over Courtney Creek Oflow in Linn County, Oregon. It was built in 1959, so it is 66 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 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 21,606 vehicles a day, roughly 25% of them trucks, projected to reach 24,900 by 2042. The structure is 84 ft (25.6 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) SB
CrossesCourtney Creek Oflow
Location138 MI N Lane-Linn Line
RouteInterstate 5
CountyLinn County
StateOregon
Coordinates44.39799, -123.0615
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure8 Very GoodNo problems noted.
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 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 rating55 US tons
Inventory rating33 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length84 ft (25.6 m)
Longest span56 ft (17.1 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) SB over Courtney Creek Oflow built?

It was built in 1959, making it 66 years old in 2025.

What condition is I-5 (hwy 1) SB over Courtney Creek 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) SB over Courtney Creek 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 Courtney Creek Oflow?

The structure is 84 ft (25.6 m) long with a longest span of 56 ft (17.1 m) and a deck 42 ft wide.

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

It is owned by the State Highway Agency.