US Bridges

Logan RD over Lewis & Clark River

Fair

Clatsop County, Oregon · 020 MI S Tucker RD JCT · Structure no. 11208A080400664

Built
1957
68 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Concrete
Length
210 ft
7 main spans
Daily traffic
263
2020 count
Owner
County
County Highway Agency

About this bridge

Logan RD over Lewis & Clark River is a concrete stringer/multi-beam or girder carrying Logan RD over Lewis & Clark River in Clatsop County, Oregon. It was built in 1957, so it is 68 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 263 vehicles a day, roughly 20% of them trucks, projected to reach 318 by 2025. The structure is 210 ft (64 m) long and 29 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesLogan RD
CrossesLewis & Clark River
Location020 MI S Tucker RD JCT
RouteCounty Highway A0731
CountyClatsop County
StateOregon
Coordinates46.07689, -123.84462
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59 US tons
Inventory rating45.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans7
Design loadUnknown
Structure length210 ft (64 m)
Longest span30 ft (9.1 m)
Deck width29 ft (8.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic263 (2020)
Projected traffic318 by 2025
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Logan RD over Lewis & Clark River built?

It was built in 1957, making it 68 years old in 2025.

What condition is Logan RD over Lewis & Clark 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 April 2023.

How much traffic does Logan RD over Lewis & Clark River carry?

About 263 vehicles per day (2020 count), of which roughly 20% are trucks.

How long is Logan RD over Lewis & Clark River?

The structure is 210 ft (64 m) long with a longest span of 30 ft (9.1 m) and a deck 29 ft wide.

Who owns Logan RD over Lewis & Clark River?

It is owned by the County Highway Agency.