US Bridges

US101 (hwy 9) over Columbia River

FairPosted for load

Clatsop County, Oregon · N End of Astoria Br · Structure no. 07949A009 00000

Built
1966
59 years old
Condition
Fair
inspected October 2023
Type
Truss - Thru
Steel
Length
3,677 ft
7 main spans
Daily traffic
9,117
2022 count
Owner
State
State Highway Agency

About this bridge

US101 (hwy 9) over Columbia River is a steel 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for other load-capacity restriction.

It carries about 9,117 vehicles a day, roughly 5% of them trucks, projected to reach 13,200 by 2042. The structure is 3,677 ft (1,120.8 m) long and 33 ft wide.

Location

Open in Google Maps
CarriesUS101 (hwy 9)
CrossesColumbia River
LocationN End of Astoria Br
RouteU.S. Route 101
CountyClatsop County
StateOregon
Coordinates46.234, -123.8715
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating33.2 US tons
Inventory rating25.7 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans7 (+8 approach)
Design loadHS 20
Structure length3,677 ft (1,120.8 m)
Longest span354 ft (107.9 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 traffic9,117 (2022)
Projected traffic13,200 by 2042
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

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 October 2023.

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

About 9,117 vehicles per day (2022 count), of which roughly 5% are trucks.

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

The structure is 3,677 ft (1,120.8 m) long with a longest span of 354 ft (107.9 m) and a deck 33 ft wide.

Who owns US101 (hwy 9) over Columbia River?

It is owned by the State Highway Agency.