US Bridges

SR 6 over Trap Creek

Good

Pacific County, Washington · 11.3 E JCT US 101 · Structure no. 0002340A0000000

Built
1918
107 years old, rebuilt 1939
Condition
Good
inspected May 2023
Type
Arch - Deck
Concrete
Length
112 ft
1 main span
Daily traffic
1,825
2023 count
Owner
State
State Highway Agency

About this bridge

SR 6 over Trap Creek is a concrete arch - deck carrying SR 6 over Trap Creek in Pacific County, Washington. It was built in 1918 and reconstructed in 1939, so it is 107 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 1,825 vehicles a day, roughly 13% of them trucks, projected to reach 2,107 by 2039. The structure is 112 ft (34.1 m) long and 31 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesSR 6
CrossesTrap Creek
Location11.3 E JCT US 101
RouteState Highway 6
CountyPacific County
StateWashington
Coordinates46.55576, -123.61139
Functional classRural Minor Arterial

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating30.8 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadH 15
Structure length112 ft (34.1 m)
Longest span40 ft (12.2 m)
Deck width31 ft (9.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,825 (2023)
Projected traffic2,107 by 2039
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

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$1.7 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 6 over Trap Creek built?

It was built in 1918, making it 107 years old in 2025. It was reconstructed in 1939.

What condition is SR 6 over Trap Creek 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 May 2023.

How much traffic does SR 6 over Trap Creek carry?

About 1,825 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is SR 6 over Trap Creek?

The structure is 112 ft (34.1 m) long with a longest span of 40 ft (12.2 m) and a deck 31 ft wide.

Who owns SR 6 over Trap Creek?

It is owned by the State Highway Agency.