US Bridges

US 12 over Satsop R Overflow

Good

Grays Harbor County, Washington · 5.1 E JCT SR 107 · Structure no. 0007612F0000000

Built
1965
60 years old
Condition
Good
inspected February 2024
Type
Slab
Concrete Continuous
Length
184 ft
7 main spans
Daily traffic
11,589
2023 count
Owner
State
State Highway Agency

About this bridge

US 12 over Satsop R Overflow is a concrete continuous slab carrying US 12 over Satsop R Overflow 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 11,589 vehicles a day, roughly 8% of them trucks, projected to reach 13,273 by 2039. The structure is 184 ft (56.1 m) long and 34 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS 12
CrossesSatsop R Overflow
Location5.1 E JCT SR 107
RouteU.S. Route 12
Coordinates46.99875, -123.49828
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 rating34 US tons
Inventory rating26.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length184 ft (56.1 m)
Longest span28 ft (8.5 m)
Deck width34 ft (10.5 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

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 statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 12 over Satsop R Overflow built?

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

What condition is US 12 over Satsop R Overflow in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in February 2024.

How much traffic does US 12 over Satsop R Overflow carry?

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

How long is US 12 over Satsop R Overflow?

The structure is 184 ft (56.1 m) long with a longest span of 28 ft (8.5 m) and a deck 34 ft wide.

Who owns US 12 over Satsop R Overflow?

It is owned by the State Highway Agency.