US Bridges

Svensen Island RD over Svensen Slough

Fair

Clatsop County, Oregon · 003 MI N of HWY 30 JCT · Structure no. 11154A040800032

Built
1960
65 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Concrete
Length
271 ft
9 main spans
Daily traffic
83
2020 count
Owner
County
County Highway Agency

About this bridge

Svensen Island RD over Svensen Slough is a concrete stringer/multi-beam or girder carrying Svensen Island RD over Svensen Slough in Clatsop County, Oregon. It was built in 1960, so it is 65 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 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 83 vehicles a day, roughly 10% of them trucks, projected to reach 97 by 2025. The structure is 271 ft (82.6 m) long and 25 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesSvensen Island RD
CrossesSvensen Slough
Location003 MI N of HWY 30 JCT
RouteCounty Highway C0408
CountyClatsop County
StateOregon
Coordinates46.1718, -123.65785
Functional classRural Local

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating45.3 US tons
Inventory rating35.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans9
Design loadHS 20
Structure length271 ft (82.6 m)
Longest span30 ft (9.1 m)
Deck width25 ft (7.6 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic83 (2020)
Projected traffic97 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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Svensen Island RD over Svensen Slough built?

It was built in 1960, making it 65 years old in 2025.

What condition is Svensen Island RD over Svensen Slough 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 April 2024.

How much traffic does Svensen Island RD over Svensen Slough carry?

About 83 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Svensen Island RD over Svensen Slough?

The structure is 271 ft (82.6 m) long with a longest span of 30 ft (9.1 m) and a deck 25 ft wide.

Who owns Svensen Island RD over Svensen Slough?

It is owned by the County Highway Agency.