US Bridges

US 12 over Satsop River

Fair

Grays Harbor County, Washington · 5.2 E JCT SR 107 · Structure no. 0007612H0000000

Built
1965
60 years old
Condition
Fair
inspected August 2023
Type
Arch - Thru
Steel
Length
410 ft
1 main span
Daily traffic
11,589
2023 count
Owner
State
State Highway Agency

About this bridge

US 12 over Satsop River is a steel arch - thru carrying US 12 over Satsop River in Grays Harbor County, Washington. It was built in 1965, so it is 60 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 11,589 vehicles a day, roughly 8% of them trucks, projected to reach 13,273 by 2039. The structure is 410 ft (125 m) long and 34 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 12
CrossesSatsop River
Location5.2 E JCT SR 107
RouteU.S. Route 12
CountyGrays Harbor County
StateWashington
Coordinates46.99957, -123.49432
Functional classRural Principal Arterial - Other

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating61 US tons
Inventory rating36 US tons

Structure

Structure typeArch - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20
Structure length410 ft (125 m)
Longest span278 ft (84.7 m)
Deck width34 ft (10.5 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deck19 ft (5.8 m)

Traffic and service

Average daily traffic11,589 (2023)
Projected traffic13,273 by 2039
Trucks8%
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 statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$7.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 12 over Satsop River built?

It was built in 1965, making it 60 years old in 2025.

What condition is US 12 over Satsop River 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 August 2023.

How much traffic does US 12 over Satsop River carry?

About 11,589 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is US 12 over Satsop River?

The structure is 410 ft (125 m) long with a longest span of 278 ft (84.7 m) and a deck 34 ft wide.

Who owns US 12 over Satsop River?

It is owned by the State Highway Agency.