US Bridges

US101 (hwy 9) over Neawanna Creek

Fair

Clatsop County, Oregon · At Seaside N C Lmts · Structure no. 01305 009 01972

Built
1930
95 years old
Condition
Fair
inspected October 2023
Type
Tee Beam
Concrete Continuous
Length
210 ft
4 main spans
Daily traffic
16,489
2022 count
Owner
State
State Highway Agency

About this bridge

US101 (hwy 9) over Neawanna Creek is a concrete continuous tee beam carrying US101 (hwy 9) over Neawanna Creek in Clatsop County, Oregon. It was built in 1930, so it is 95 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 16,489 vehicles a day, roughly 4% of them trucks, projected to reach 16,600 by 2042. The structure is 210 ft (64 m) long and 39 ft wide. If it were closed, the detour would be 39.8 mi (64 km).

Location

Open in Google Maps
CarriesUS101 (hwy 9)
CrossesNeawanna Creek
LocationAt Seaside N C Lmts
RouteU.S. Route 101
CountyClatsop County
StateOregon
Coordinates46.01083, -123.91141
Functional classUrban Other Principal Arterial

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating22.8 US tons
Inventory rating17.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length210 ft (64 m)
Longest span52 ft (16 m)
Deck width39 ft (12 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,489 (2022)
Projected traffic16,600 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed39.8 mi (64 km)
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 statusEligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$1.1 million
NavigationNo navigation control on waterway

Frequently asked questions

When was US101 (hwy 9) over Neawanna Creek built?

It was built in 1930, making it 95 years old in 2025.

What condition is US101 (hwy 9) over Neawanna Creek 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 Neawanna Creek carry?

About 16,489 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is US101 (hwy 9) over Neawanna Creek?

The structure is 210 ft (64 m) long with a longest span of 52 ft (16 m) and a deck 39 ft wide.

Who owns US101 (hwy 9) over Neawanna Creek?

It is owned by the State Highway Agency.