US Bridges

US 12 over US 12

Fair

Grays Harbor County, Washington · JCT SR 8 · Structure no. 0007106A0000000

Built
1963
62 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
144 ft
3 main spans
Daily traffic
8,404
2023 count
Owner
State
State Highway Agency

About this bridge

US 12 over US 12 is a prestressed concrete stringer/multi-beam or girder carrying US 12 over US 12 in Grays Harbor County, Washington. It was built in 1963, so it is 62 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 5 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 8,404 vehicles a day, roughly 9% of them trucks, projected to reach 9,769 by 2039. The structure is 144 ft (43.9 m) long and 35 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesUS 12
CrossesUS 12
LocationJCT SR 8
RouteU.S. Route 12
CountyGrays Harbor County
StateWashington
Coordinates47.00506, -123.38803
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86 US tons
Inventory rating51 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length144 ft (43.9 m)
Longest span61 ft (18.6 m)
Deck width35 ft (10.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,404 (2023)
Projected traffic9,769 by 2039
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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$2.7 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 12 over US 12 built?

It was built in 1963, making it 62 years old in 2025.

What condition is US 12 over US 12 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 September 2023.

How much traffic does US 12 over US 12 carry?

About 8,404 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is US 12 over US 12?

The structure is 144 ft (43.9 m) long with a longest span of 61 ft (18.6 m) and a deck 35 ft wide.

Who owns US 12 over US 12?

It is owned by the State Highway Agency.