US Bridges

Mox Chehalis Road over Mox Chehalis Creek

Fair

Grays Harbor County, Washington · 1.4 NE JCT SR12 · Structure no. 080930000000000

Built
1964
61 years old
Condition
Fair
inspected March 2023
Type
Slab
Concrete Continuous
Length
104 ft
3 main spans
Daily traffic
605
2023 count
Owner
County
County Highway Agency

About this bridge

Mox Chehalis Road over Mox Chehalis Creek is a concrete continuous slab carrying Mox Chehalis Road over Mox Chehalis Creek in Grays Harbor County, Washington. It was built in 1964, so it is 61 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 605 vehicles a day, roughly 15% of them trucks, projected to reach 853 by 2040. The structure is 104 ft (31.7 m) long and 26 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

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CarriesMox Chehalis Road
CrossesMox Chehalis Creek
Location1.4 NE JCT SR12
RouteCounty Highway 86190
CountyGrays Harbor County
StateWashington
Coordinates46.96806, -123.30861
Functional classRural Major 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 protection7 GoodSome minor problems.
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 alignment6: Equal to present minimum criteria
Operating rating44.3 US tons
Inventory rating34.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length104 ft (31.7 m)
Longest span40 ft (12.2 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic605 (2023)
Projected traffic853 by 2040
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.8 mi (27 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Mox Chehalis Road over Mox Chehalis Creek built?

It was built in 1964, making it 61 years old in 2025.

What condition is Mox Chehalis Road over Mox Chehalis 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 March 2023.

How much traffic does Mox Chehalis Road over Mox Chehalis Creek carry?

About 605 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is Mox Chehalis Road over Mox Chehalis Creek?

The structure is 104 ft (31.7 m) long with a longest span of 40 ft (12.2 m) and a deck 26 ft wide.

Who owns Mox Chehalis Road over Mox Chehalis Creek?

It is owned by the County Highway Agency.