US Bridges

SR 8 over Cloquallum CR

Good

Grays Harbor County, Washington · 1.1 E JCT US 12 · Structure no. 0006705B0000000

Built
1962
63 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
168 ft
3 main spans
Daily traffic
10,124
2023 count
Owner
State
State Highway Agency

About this bridge

SR 8 over Cloquallum CR is a prestressed concrete stringer/multi-beam or girder carrying SR 8 over Cloquallum CR in Grays Harbor County, Washington. It was built in 1962, so it is 63 years old, older 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 10,124 vehicles a day, roughly 10% of them trucks, projected to reach 11,350 by 2039. The structure is 168 ft (51.2 m) long and 35 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSR 8
CrossesCloquallum CR
Location1.1 E JCT US 12
RouteState Highway 8
CountyGrays Harbor County
StateWashington
Coordinates47.01231, -123.36664
Functional classRural Principal Arterial - Other

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
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 rating84 US tons
Inventory rating46 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length168 ft (51.2 m)
Longest span82 ft (25 m)
Deck width35 ft (10.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,124 (2023)
Projected traffic11,350 by 2039
Trucks10%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

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$3.2 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 8 over Cloquallum CR built?

It was built in 1962, making it 63 years old in 2025.

What condition is SR 8 over Cloquallum CR 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 August 2023.

How much traffic does SR 8 over Cloquallum CR carry?

About 10,124 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is SR 8 over Cloquallum CR?

The structure is 168 ft (51.2 m) long with a longest span of 82 ft (25 m) and a deck 35 ft wide.

Who owns SR 8 over Cloquallum CR?

It is owned by the State Highway Agency.