US Bridges

County Arterial over W B 3 B

FairPosted for load

Franklin County, Washington · 1.47 S JCT SR 24 · Structure no. 081018000000000

Built
1958
67 years old, rebuilt 1998
Condition
Fair
inspected December 2023
Type
Channel Beam
Prestressed Concrete
Length
40 ft
2 main spans
Daily traffic
2,810
2023 count
Owner
County
County Highway Agency

About this bridge

County Arterial over W B 3 B is a prestressed concrete channel beam carrying County Arterial over W B 3 B in Franklin County, Washington. It was built in 1958 and reconstructed in 1998, so it is 67 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 2,810 vehicles a day, roughly 26% of them trucks, projected to reach 5,010 by 2040. The structure is 40 ft (12.2 m) long and 36 ft wide. If it were closed, the detour would be 18 mi (29 km).

Location

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CarriesCounty Arterial
CrossesW B 3 B
Location1.47 S JCT SR 24
RouteCounty Highway 4000
CountyFranklin County
StateWashington
Coordinates46.71994, -119.17635
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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be 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 rating24.7 US tons
Inventory rating19 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckOther
Main spans2
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span20 ft (6.1 m)
Deck width36 ft (11 m)
Roadway width35 ft (10.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,810 (2023)
Projected traffic5,010 by 2040
Trucks26%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18 mi (29 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County Arterial over W B 3 B built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 1998.

What condition is County Arterial over W B 3 B 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 December 2023.

How much traffic does County Arterial over W B 3 B carry?

About 2,810 vehicles per day (2023 count), of which roughly 26% are trucks.

How long is County Arterial over W B 3 B?

The structure is 40 ft (12.2 m) long with a longest span of 20 ft (6.1 m) and a deck 36 ft wide.

Who owns County Arterial over W B 3 B?

It is owned by the County Highway Agency.