US Bridges

Or 47 (hwy 102) over Nehalem River

PoorPosted for load

Columbia County, Oregon · Vernonia City Limits · Structure no. 02323 102 06128

Built
1938
87 years old
Condition
Poor
inspected May 2024
Type
Truss - Thru
Steel
Length
210 ft
1 main span
Daily traffic
2,938
2022 count
Owner
State
State Highway Agency

About this bridge

Or 47 (hwy 102) over Nehalem River is a steel truss - thru carrying Or 47 (hwy 102) over Nehalem River in Columbia County, Oregon. It was built in 1938, so it is 87 years old, older than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 2,938 vehicles a day, roughly 10% of them trucks, projected to reach 3,200 by 2042. The structure is 210 ft (63.9 m) long and 38 ft wide. If it were closed, the detour would be 18.6 mi (30 km).

CarriesOr 47 (hwy 102)
CrossesNehalem River
LocationVernonia City Limits
RouteState Highway 47
StateOregon
Coordinates45.85816, -123.17267
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating21.4 US tons
Inventory rating16.4 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+5 approach)
Design loadH 15
Structure length210 ft (63.9 m)
Longest span120 ft (36.7 m)
Deck width38 ft (11.6 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deck14 ft (4.3 m)

Traffic and service

Average daily traffic2,938 (2022)
Projected traffic3,200 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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 statusEligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.2 million
NavigationNo navigation control on waterway

Frequently asked questions

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

It was built in 1938, making it 87 years old in 2025.

What condition is Or 47 (hwy 102) over Nehalem River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2024.

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

About 2,938 vehicles per day (2022 count), of which roughly 10% are trucks.

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

The structure is 210 ft (63.9 m) long with a longest span of 120 ft (36.7 m) and a deck 38 ft wide.

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

It is owned by the State Highway Agency.