US Bridges

Mox Chehalis Road over Mox Chehalis Creek

Fair

Grays Harbor County, Washington · 4.7 NE JCT SR 12 · Structure no. 084660000000000

Built
1966
59 years old
Condition
Fair
inspected March 2023
Type
Slab
Prestressed Concrete
Length
30 ft
1 main span
Daily traffic
685
2023 count
Owner
County
County Highway Agency

About this bridge

Mox Chehalis Road over Mox Chehalis Creek is a prestressed concrete slab carrying Mox Chehalis Road over Mox Chehalis Creek in Grays Harbor County, Washington. It was built in 1966, so it is 59 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 685 vehicles a day, roughly 15% of them trucks, projected to reach 1,053 by 2040. The structure is 30 ft (9.1 m) long and 25 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

Open in Google Maps
CarriesMox Chehalis Road
CrossesMox Chehalis Creek
Location4.7 NE JCT SR 12
RouteCounty Highway 86190
CountyGrays Harbor County
StateWashington
Coordinates46.99722, -123.29444
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 protection8 Very GoodNo problems noted.
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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.9 US tons
Inventory rating31.7 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 15
Structure length30 ft (9.1 m)
Longest span30 ft (9.1 m)
Deck width25 ft (7.6 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic685 (2023)
Projected traffic1,053 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mox Chehalis Road over Mox Chehalis Creek built?

It was built in 1966, making it 59 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 685 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is Mox Chehalis Road over Mox Chehalis Creek?

The structure is 30 ft (9.1 m) long with a longest span of 30 ft (9.1 m) and a deck 25 ft wide.

Who owns Mox Chehalis Road over Mox Chehalis Creek?

It is owned by the County Highway Agency.