US Bridges

US101 (hwy 9) over Columbia River

Fair

Clatsop County, Oregon · Main Through Truss Spans · Structure no. 07949C009 00241

Built
1966
59 years old
Condition
Fair
inspected May 2024
Type
Truss - Thru
Steel Continuous
Length
2,469 ft
3 main spans
Daily traffic
22,526
2024 count
Owner
State
State Highway Agency

About this bridge

US101 (hwy 9) over Columbia River is a steel continuous truss - thru carrying US101 (hwy 9) over Columbia River in Clatsop County, Oregon. It was built in 1966, so it is 59 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 22,526 vehicles a day, roughly 20% of them trucks, projected to reach 25,600 by 2042. The structure is 2,469 ft (752.6 m) long and 33 ft wide.

Location

Open in Google Maps
CarriesUS101 (hwy 9)
CrossesColumbia River
LocationMain Through Truss Spans
RouteU.S. Route 101
CountyClatsop County
StateOregon
Coordinates46.20409, -123.85599
Functional classRural Principal Arterial - Other

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating19.6 US tons
Inventory rating15.3 US tons

Structure

Structure typeTruss - Thru
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length2,469 ft (752.6 m)
Longest span1,232 ft (375.5 m)
Deck width33 ft (10.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deck17 ft (5.2 m)

Traffic and service

Average daily traffic22,526 (2024)
Projected traffic25,600 by 2042
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was US101 (hwy 9) over Columbia River built?

It was built in 1966, making it 59 years old in 2025.

What condition is US101 (hwy 9) over Columbia River 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 May 2024.

How much traffic does US101 (hwy 9) over Columbia River carry?

About 22,526 vehicles per day (2024 count), of which roughly 20% are trucks.

How long is US101 (hwy 9) over Columbia River?

The structure is 2,469 ft (752.6 m) long with a longest span of 1,232 ft (375.5 m) and a deck 33 ft wide.

Who owns US101 (hwy 9) over Columbia River?

It is owned by the State Highway Agency.