US Bridges

US101 (hwy 9) over Nehalem River

Fair

Tillamook County, Oregon · 005 MI S Nehalem · Structure no. 00574F009 04561

Built
1984
41 years old
Condition
Fair
inspected March 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
1,062 ft
5 main spans
Daily traffic
6,283
2022 count
Owner
State
State Highway Agency

About this bridge

US101 (hwy 9) over Nehalem River is a prestressed concrete continuous box beam or girders - multiple carrying US101 (hwy 9) over Nehalem River in Tillamook County, Oregon. It was built in 1984, so it is 41 years old, younger 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 6,283 vehicles a day, roughly 13% of them trucks, projected to reach 7,300 by 2042. The structure is 1,062 ft (323.7 m) long and 44 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesUS101 (hwy 9)
CrossesNehalem River
Location005 MI S Nehalem
RouteU.S. Route 101
CountyTillamook County
StateOregon
Coordinates45.70917, -123.88953
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 inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26.5 US tons
Inventory rating20.4 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 25 or greater
Structure length1,062 ft (323.7 m)
Longest span235 ft (71.6 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,283 (2022)
Projected traffic7,300 by 2042
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed6.2 mi (10 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 Nehalem River built?

It was built in 1984, making it 41 years old in 2025.

What condition is US101 (hwy 9) over Nehalem 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 March 2023.

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

About 6,283 vehicles per day (2022 count), of which roughly 13% are trucks.

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

The structure is 1,062 ft (323.7 m) long with a longest span of 235 ft (71.6 m) and a deck 44 ft wide.

Who owns US101 (hwy 9) over Nehalem River?

It is owned by the State Highway Agency.