US Bridges

SR 508 over S Fork Newaukum River

Good

Lewis County, Washington · 13.7 E JCT I-5 · Structure no. 0019197A0000000

Built
2018
7 years old
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
225 ft
2 main spans
Daily traffic
1,714
2023 count
Owner
State
State Highway Agency

About this bridge

SR 508 over S Fork Newaukum River is a prestressed concrete continuous stringer/multi-beam or girder carrying SR 508 over S Fork Newaukum River in Lewis County, Washington. It was built in 2018, so it is 7 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,714 vehicles a day, roughly 11% of them trucks, projected to reach 2,059 by 2039. The structure is 225 ft (68.6 m) long and 35 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

CarriesSR 508
CrossesS Fork Newaukum River
Location13.7 E JCT I-5
RouteState Highway 508
Coordinates46.61161, -122.62917
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable 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 alignment8: Equal to present desirable criteria
Operating rating53.2 US tons
Inventory rating41.1 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length225 ft (68.6 m)
Longest span153 ft (46.6 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,714 (2023)
Projected traffic2,059 by 2039
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$3.6 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 508 over S Fork Newaukum River built?

It was built in 2018, making it 7 years old in 2025.

What condition is SR 508 over S Fork Newaukum River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in March 2023.

How much traffic does SR 508 over S Fork Newaukum River carry?

About 1,714 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is SR 508 over S Fork Newaukum River?

The structure is 225 ft (68.6 m) long with a longest span of 153 ft (46.6 m) and a deck 35 ft wide.

Who owns SR 508 over S Fork Newaukum River?

It is owned by the State Highway Agency.