US Bridges

Cloquallum Road over Cloquallum Creek

Fair

Grays Harbor County, Washington · 0.7 NE JCT CR 9740 · Structure no. 084049000000000

Built
1915
110 years old, rebuilt 1976
Condition
Fair
inspected February 2023
Type
Arch - Deck
Concrete
Length
77 ft
1 main span
Daily traffic
1,380
2023 count
Owner
County
County Highway Agency

About this bridge

Cloquallum Road over Cloquallum Creek is a concrete arch - deck carrying Cloquallum Road over Cloquallum Creek in Grays Harbor County, Washington. It was built in 1915 and reconstructed in 1976, so it is 110 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 1,380 vehicles a day, roughly 7% of them trucks, projected to reach 1,684 by 2043. The structure is 77 ft (23.5 m) long and 26 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCloquallum Road
CrossesCloquallum Creek
Location0.7 NE JCT CR 9740
RouteCounty Highway 78150
CountyGrays Harbor County
StateWashington
Coordinates47.02278, -123.365
Functional classRural Minor 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating17 US tons
Inventory rating10 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length77 ft (23.5 m)
Longest span50 ft (15.2 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,380 (2023)
Projected traffic1,684 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$3.1 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Cloquallum Road over Cloquallum Creek built?

It was built in 1915, making it 110 years old in 2025. It was reconstructed in 1976.

What condition is Cloquallum Road over Cloquallum Creek 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 February 2023.

How much traffic does Cloquallum Road over Cloquallum Creek carry?

About 1,380 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Cloquallum Road over Cloquallum Creek?

The structure is 77 ft (23.5 m) long with a longest span of 50 ft (15.2 m) and a deck 26 ft wide.

Who owns Cloquallum Road over Cloquallum Creek?

It is owned by the County Highway Agency.