US Bridges

Or 47 (hwy 102) over Nehalem River

Fair

Columbia County, Oregon · 5.0 MI N Vernonia · Structure no. 03145A102 05768

Built
1959
66 years old
Condition
Fair
inspected October 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
210 ft
3 main spans
Daily traffic
1,371
2022 count
Owner
State
State Highway Agency

About this bridge

Or 47 (hwy 102) over Nehalem River is a concrete continuous box beam or girders - multiple carrying Or 47 (hwy 102) over Nehalem River in Columbia County, Oregon. It was built in 1959, so it is 66 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 1,371 vehicles a day, roughly 29% of them trucks, projected to reach 1,500 by 2042. The structure is 210 ft (64 m) long and 31 ft wide. If it were closed, the detour would be 18.6 mi (30 km).

Location

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CarriesOr 47 (hwy 102)
CrossesNehalem River
Location5.0 MI N Vernonia
RouteState Highway 47
CountyColumbia County
StateOregon
Coordinates45.8994, -123.15602
Functional classRural Major Collector

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.1 US tons
Inventory rating31.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length210 ft (64 m)
Longest span80 ft (24.4 m)
Deck width31 ft (9.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,371 (2022)
Projected traffic1,500 by 2042
Trucks29%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18.6 mi (30 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Or 47 (hwy 102) over Nehalem River built?

It was built in 1959, making it 66 years old in 2025.

What condition is Or 47 (hwy 102) 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 October 2024.

How much traffic does Or 47 (hwy 102) over Nehalem River carry?

About 1,371 vehicles per day (2022 count), of which roughly 29% are trucks.

How long is Or 47 (hwy 102) over Nehalem River?

The structure is 210 ft (64 m) long with a longest span of 80 ft (24.4 m) and a deck 31 ft wide.

Who owns Or 47 (hwy 102) over Nehalem River?

It is owned by the State Highway Agency.