US Bridges

US101 (hwy 9) over Youngs Bay

FairPosted for load

Clatsop County, Oregon · At Smith Point · Structure no. 08306 009 00491

Built
1964
61 years old
Condition
Fair
inspected May 2024
Type
Movable - Lift
Steel
Length
4,208 ft
2 main spans
Daily traffic
20,338
2022 count
Owner
State
State Highway Agency

About this bridge

US101 (hwy 9) over Youngs Bay is a steel movable - lift carrying US101 (hwy 9) over Youngs Bay in Clatsop County, Oregon. It was built in 1964, so it is 61 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. Its operating status is: posted for other load-capacity restriction.

It carries about 20,338 vehicles a day, roughly 4% of them trucks, projected to reach 23,000 by 2042. The structure is 4,208 ft (1,282.7 m) long and 35 ft wide. If it were closed, the detour would be 4.3 mi (7 km).

Location

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CarriesUS101 (hwy 9)
CrossesYoungs Bay
LocationAt Smith Point
RouteU.S. Route 101
CountyClatsop County
StateOregon
Coordinates46.17618, -123.86847
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating15.8 US tons
Inventory rating12.1 US tons

Structure

Structure typeMovable - Lift
MaterialSteel
DeckConcrete, cast-in-place
Main spans2 (+50 approach)
Design loadHS 20
Structure length4,208 ft (1,282.7 m)
Longest span153 ft (46.5 m)
Deck width35 ft (10.6 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deck16 ft (5 m)

Traffic and service

Average daily traffic20,338 (2022)
Projected traffic23,000 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed4.3 mi (7 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 statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was US101 (hwy 9) over Youngs Bay built?

It was built in 1964, making it 61 years old in 2025.

What condition is US101 (hwy 9) over Youngs Bay 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 Youngs Bay carry?

About 20,338 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is US101 (hwy 9) over Youngs Bay?

The structure is 4,208 ft (1,282.7 m) long with a longest span of 153 ft (46.5 m) and a deck 35 ft wide.

Who owns US101 (hwy 9) over Youngs Bay?

It is owned by the State Highway Agency.