US Bridges

I-5 over Linwood Ave

Good

Thurston County, Washington · 4.0 N JCT SR 121 · Structure no. 0004887A0000000

Built
1955
70 years old, rebuilt 1990
Condition
Good
inspected September 2024
Type
Slab
Concrete
Length
53 ft
1 main span
Daily traffic
51,489
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 over Linwood Ave is a concrete slab carrying I-5 over Linwood Ave in Thurston County, Washington. It was built in 1955 and reconstructed in 1990, so it is 70 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 51,489 vehicles a day, roughly 13% of them trucks, projected to reach 79,000 by 2039. The structure is 53 ft (16.2 m) long and 107 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesI-5
CrossesLinwood Ave
Location4.0 N JCT SR 121
RouteInterstate 5
Coordinates47.0069, -122.90816
Functional classUrban Principal Arterial - Interstate

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.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65 US tons
Inventory rating38 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length53 ft (16.2 m)
Longest span51 ft (15.5 m)
Deck width107 ft (32.6 m)
Roadway width104 ft (31.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic51,489 (2023)
Projected traffic79,000 by 2039
Trucks13%
Lanes on structure6
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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$2.7 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 over Linwood Ave built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 1990.

What condition is I-5 over Linwood Ave 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 September 2024.

How much traffic does I-5 over Linwood Ave carry?

About 51,489 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is I-5 over Linwood Ave?

The structure is 53 ft (16.2 m) long with a longest span of 51 ft (15.5 m) and a deck 107 ft wide.

Who owns I-5 over Linwood Ave?

It is owned by the State Highway Agency.