US Bridges

Centralia Alpha RD over No.Fk Newaukum River

FairPosted for load

Lewis County, Washington · 0.04 SE JCT 46000 · Structure no. 081158000000000

Built
1960
65 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Concrete
Length
140 ft
2 main spans
Daily traffic
839
2021 count
Owner
County
County Highway Agency

About this bridge

Centralia Alpha RD over No.Fk Newaukum River is a concrete stringer/multi-beam or girder carrying Centralia Alpha RD over No.Fk Newaukum River in Lewis County, Washington. It was built in 1960, so it is 65 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 839 vehicles a day, roughly 18% of them trucks, projected to reach 1,498 by 2041. The structure is 140 ft (42.7 m) long and 26 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCentralia Alpha RD
CrossesNo.Fk Newaukum River
Location0.04 SE JCT 46000
RouteCounty Highway 94001
CountyLewis County
StateWashington
Coordinates46.62719, -122.791
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
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 rating34.9 US tons
Inventory rating20.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 15
Structure length140 ft (42.7 m)
Longest span60 ft (18.3 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic839 (2021)
Projected traffic1,498 by 2041
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$1.7 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Centralia Alpha RD over No.Fk Newaukum River built?

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

What condition is Centralia Alpha RD over No.Fk Newaukum 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 January 2024.

How much traffic does Centralia Alpha RD over No.Fk Newaukum River carry?

About 839 vehicles per day (2021 count), of which roughly 18% are trucks.

How long is Centralia Alpha RD over No.Fk Newaukum River?

The structure is 140 ft (42.7 m) long with a longest span of 60 ft (18.3 m) and a deck 26 ft wide.

Who owns Centralia Alpha RD over No.Fk Newaukum River?

It is owned by the County Highway Agency.