US Bridges

Swedetown Road over Clatskanie River

Fair

Columbia County, Oregon · 060 M SW City of Clatskan · Structure no. 18036 41900 601

Built
1999
26 years old
Condition
Fair
inspected May 2023
Type
Tee Beam
Prestressed Concrete
Length
86 ft
1 main span
Daily traffic
540
2020 count
Owner
County
County Highway Agency

About this bridge

Swedetown Road over Clatskanie River is a prestressed concrete tee beam carrying Swedetown Road over Clatskanie River in Columbia County, Oregon. It was built in 1999, so it is 26 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 540 vehicles a day, roughly 10% of them trucks, projected to reach 610 by 2025. The structure is 86 ft (26.2 m) long and 31 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesSwedetown Road
CrossesClatskanie River
Location060 M SW City of Clatskan
RouteCounty Highway C4190
CountyColumbia County
StateOregon
Coordinates46.04839, -123.12016
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
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 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 rating31.7 US tons
Inventory rating24.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length86 ft (26.2 m)
Longest span83 ft (25.3 m)
Deck width31 ft (9.6 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic540 (2020)
Projected traffic610 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 Swedetown Road over Clatskanie River built?

It was built in 1999, making it 26 years old in 2025.

What condition is Swedetown Road over Clatskanie 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 May 2023.

How much traffic does Swedetown Road over Clatskanie River carry?

About 540 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Swedetown Road over Clatskanie River?

The structure is 86 ft (26.2 m) long with a longest span of 83 ft (25.3 m) and a deck 31 ft wide.

Who owns Swedetown Road over Clatskanie River?

It is owned by the County Highway Agency.