US Bridges

Smith Road over S Fk Scappoose Creek

Fair

Columbia County, Oregon · 010 N Scappoose · Structure no. 13733A114600010

Built
1978
47 years old
Condition
Fair
inspected May 2023
Type
Slab
Prestressed Concrete
Length
60 ft
1 main span
Daily traffic
302
2020 count
Owner
County
County Highway Agency

About this bridge

Smith Road over S Fk Scappoose Creek is a prestressed concrete slab carrying Smith Road over S Fk Scappoose Creek in Columbia County, Oregon. It was built in 1978, so it is 47 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 302 vehicles a day, roughly 10% of them trucks, projected to reach 342 by 2025. The structure is 60 ft (18.3 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSmith Road
CrossesS Fk Scappoose Creek
Location010 N Scappoose
RouteCounty Highway C1146
CountyColumbia County
StateOregon
Coordinates45.7618, -122.88158
Functional classRural Minor 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.
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 inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.7 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length60 ft (18.3 m)
Longest span59 ft (18 m)
Deck width32 ft (9.8 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic302 (2020)
Projected traffic342 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Smith Road over S Fk Scappoose Creek built?

It was built in 1978, making it 47 years old in 2025.

What condition is Smith Road over S Fk Scappoose 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 May 2023.

How much traffic does Smith Road over S Fk Scappoose Creek carry?

About 302 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Smith Road over S Fk Scappoose Creek?

The structure is 60 ft (18.3 m) long with a longest span of 59 ft (18 m) and a deck 32 ft wide.

Who owns Smith Road over S Fk Scappoose Creek?

It is owned by the County Highway Agency.