US Bridges

SR 6 over I-5

Fair

Lewis County, Washington · 26.7 E Pacific CO · Structure no. 0011430B0000000

Built
1980
45 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
214 ft
2 main spans
Daily traffic
12,275
2023 count
Owner
State
State Highway Agency

About this bridge

SR 6 over I-5 is a prestressed concrete stringer/multi-beam or girder carrying SR 6 over I-5 in Lewis County, Washington. It was built in 1980, so it is 45 years old, younger 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 12,275 vehicles a day, roughly 6% of them trucks, projected to reach 15,998 by 2039. The structure is 214 ft (65.2 m) long and 72 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSR 6
CrossesI-5
Location26.7 E Pacific CO
RouteState Highway 6
CountyLewis County
StateWashington
Coordinates46.66033, -122.97886
Functional classUrban Other Principal 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.6 US tons
Inventory rating25.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length214 ft (65.2 m)
Longest span104 ft (31.6 m)
Deck width72 ft (21.8 m)
Roadway width61 ft (18.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,275 (2023)
Projected traffic15,998 by 2039
Trucks6%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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$6.5 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 6 over I-5 built?

It was built in 1980, making it 45 years old in 2025.

What condition is SR 6 over I-5 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 November 2023.

How much traffic does SR 6 over I-5 carry?

About 12,275 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is SR 6 over I-5?

The structure is 214 ft (65.2 m) long with a longest span of 104 ft (31.6 m) and a deck 72 ft wide.

Who owns SR 6 over I-5?

It is owned by the State Highway Agency.