US Bridges

SR 107 over Chehalis River

Fair

Grays Harbor County, Washington · 6.8 N JCT US 101 · Structure no. 0005827A0000000

Built
1958
67 years old, rebuilt 2021
Condition
Fair
inspected March 2023
Type
Truss - Thru
Steel
Length
1,310 ft
1 main span
Daily traffic
4,044
2023 count
Owner
State
State Highway Agency

About this bridge

SR 107 over Chehalis River is a steel truss - thru carrying SR 107 over Chehalis River in Grays Harbor County, Washington. It was built in 1958 and reconstructed in 2021, 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.

It carries about 4,044 vehicles a day, roughly 10% of them trucks, projected to reach 4,578 by 2039. The structure is 1,310 ft (399.3 m) long and 32 ft wide. If it were closed, the detour would be 24.9 mi (40 km).

Location

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CarriesSR 107
CrossesChehalis River
Location6.8 N JCT US 101
RouteState Highway 107
CountyGrays Harbor County
StateWashington
Coordinates46.95961, -123.60311
Functional classRural Minor Arterial

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to 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 rating34 US tons
Inventory rating26.5 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+6 approach)
Design loadHS 20
Structure length1,310 ft (399.3 m)
Longest span300 ft (91.4 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deck17 ft (5.2 m)

Traffic and service

Average daily traffic4,044 (2023)
Projected traffic4,578 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed24.9 mi (40 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$19.9 million (2022 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was SR 107 over Chehalis River built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 2021.

What condition is SR 107 over Chehalis 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 March 2023.

How much traffic does SR 107 over Chehalis River carry?

About 4,044 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is SR 107 over Chehalis River?

The structure is 1,310 ft (399.3 m) long with a longest span of 300 ft (91.4 m) and a deck 32 ft wide.

Who owns SR 107 over Chehalis River?

It is owned by the State Highway Agency.