US Bridges

SR 6 over Unnamed Creek

Good

Lewis County, Washington · 21.8 E Pacific CO · Structure no. 0019554A0000000

Built
2021
4 years old
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
125 ft
1 main span
Daily traffic
7,228
2023 count
Owner
State
State Highway Agency

About this bridge

SR 6 over Unnamed Creek is a prestressed concrete stringer/multi-beam or girder carrying SR 6 over Unnamed Creek in Lewis County, Washington. It was built in 2021, so it is 4 years old, younger 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 7,228 vehicles a day, roughly 9% of them trucks, projected to reach 9,523 by 2039. The structure is 125 ft (38.1 m) long and 43 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesSR 6
CrossesUnnamed Creek
Location21.8 E Pacific CO
RouteState Highway 6
CountyLewis County
StateWashington
Coordinates46.62698, -123.06298
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable 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 rating72.1 US tons
Inventory rating47.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length125 ft (38.1 m)
Longest span120 ft (36.6 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,228 (2023)
Projected traffic9,523 by 2039
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

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$2.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 6 over Unnamed Creek built?

It was built in 2021, making it 4 years old in 2025.

What condition is SR 6 over Unnamed 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 October 2023.

How much traffic does SR 6 over Unnamed Creek carry?

About 7,228 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is SR 6 over Unnamed Creek?

The structure is 125 ft (38.1 m) long with a longest span of 120 ft (36.6 m) and a deck 43 ft wide.

Who owns SR 6 over Unnamed Creek?

It is owned by the State Highway Agency.