US Bridges

SR 432 over Cowlitz R & Np RY

Fair

Cowlitz County, Washington · 2.0 E JCT SR 411 · Structure no. 0006321A0000000

Built
1961
64 years old, rebuilt 1971
Condition
Fair
inspected April 2023
Type
Truss - Thru
Steel
Length
1,676 ft
1 main span
Daily traffic
19,487
2023 count
Owner
State
State Highway Agency

About this bridge

SR 432 over Cowlitz R & Np RY is a steel truss - thru carrying SR 432 over Cowlitz R & Np RY in Cowlitz County, Washington. It was built in 1961 and reconstructed in 1971, so it is 64 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 19,487 vehicles a day, roughly 11% of them trucks, projected to reach 23,768 by 2039. The structure is 1,676 ft (510.8 m) long and 32 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSR 432
CrossesCowlitz R & Np RY
Location2.0 E JCT SR 411
RouteState Highway 432
CountyCowlitz County
StateWashington
Coordinates46.10691, -122.89442
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68 US tons
Inventory rating41 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+12 approach)
Design loadHS 20 + Mod
Structure length1,676 ft (510.8 m)
Longest span300 ft (91.4 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9 m)
Vertical clearance over deck16 ft (4.8 m)

Traffic and service

Average daily traffic19,487 (2023)
Projected traffic23,768 by 2039
Trucks11%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway, waterway and railroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$30.3 million (2022 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was SR 432 over Cowlitz R & Np RY built?

It was built in 1961, making it 64 years old in 2025. It was reconstructed in 1971.

What condition is SR 432 over Cowlitz R & Np RY 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 SR 432 over Cowlitz R & Np RY carry?

About 19,487 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is SR 432 over Cowlitz R & Np RY?

The structure is 1,676 ft (510.8 m) long with a longest span of 300 ft (91.4 m) and a deck 32 ft wide.

Who owns SR 432 over Cowlitz R & Np RY?

It is owned by the State Highway Agency.