US Bridges

SR 6 over Half Moon Creek

Fair

Pacific County, Washington · 14.6 E JCT US 101 · Structure no. 0002340C0000000

Built
1917
108 years old, rebuilt 1939
Condition
Fair
inspected April 2024
Type
Arch - Deck
Concrete
Length
60 ft
1 main span
Daily traffic
1,600
2023 count
Owner
State
State Highway Agency

About this bridge

SR 6 over Half Moon Creek is a concrete arch - deck carrying SR 6 over Half Moon Creek in Pacific County, Washington. It was built in 1917 and reconstructed in 1939, so it is 108 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 1,600 vehicles a day, roughly 13% of them trucks, projected to reach 1,667 by 2039. The structure is 60 ft (18.3 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
CrossesHalf Moon Creek
Location14.6 E JCT US 101
RouteState Highway 6
CountyPacific County
StateWashington
Coordinates46.55986, -123.55086
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
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 rating25 US tons
Inventory rating15 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans1
Design loadH 15
Structure length60 ft (18.3 m)
Longest span60 ft (18.3 m)
Deck width31 ft (9.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,600 (2023)
Projected traffic1,667 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$969,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 6 over Half Moon Creek built?

It was built in 1917, making it 108 years old in 2025. It was reconstructed in 1939.

What condition is SR 6 over Half Moon 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 April 2024.

How much traffic does SR 6 over Half Moon Creek carry?

About 1,600 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is SR 6 over Half Moon Creek?

The structure is 60 ft (18.3 m) long with a longest span of 60 ft (18.3 m) and a deck 31 ft wide.

Who owns SR 6 over Half Moon Creek?

It is owned by the State Highway Agency.