US Bridges

SR 508 over S Fork Newaukum River

Good

Lewis County, Washington · 2.6 E JCT I-5 · Structure no. 0013425A0000000

Built
1989
36 years old
Condition
Good
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
320 ft
3 main spans
Daily traffic
4,376
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 1989, so it is 36 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,376 vehicles a day, roughly 6% of them trucks, projected to reach 5,918 by 2039. The structure is 320 ft (97.5 m) long and 36 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesSR 508
CrossesS Fork Newaukum River
Location2.6 E JCT I-5
RouteState Highway 508
Coordinates46.57608, -122.83706
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
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 rating63.9 US tons
Inventory rating38 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length320 ft (97.5 m)
Longest span107 ft (32.6 m)
Deck width36 ft (10.9 m)
Roadway width33 ft (10 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,376 (2023)
Projected traffic5,918 by 2039
Trucks6%
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

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$5.2 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 1989, making it 36 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 February 2023.

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

About 4,376 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is SR 508 over S Fork Newaukum River?

The structure is 320 ft (97.5 m) long with a longest span of 107 ft (32.6 m) and a deck 36 ft wide.

Who owns SR 508 over S Fork Newaukum River?

It is owned by the State Highway Agency.