US Bridges

I-5 over Pacific Ave

Fair

Thurston County, Washington · 3.4 N JCT US 101 · Structure no. 0005455A0000000

Built
1957
68 years old, rebuilt 1987
Condition
Fair
inspected September 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
351 ft
3 main spans
Daily traffic
59,814
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 over Pacific Ave is a prestressed concrete continuous box beam or girders - multiple carrying I-5 over Pacific Ave in Thurston County, Washington. It was built in 1957 and reconstructed in 1987, so it is 68 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 59,814 vehicles a day, roughly 10% of them trucks, projected to reach 91,181 by 2039. The structure is 351 ft (107 m) long and 141 ft wide.

CarriesI-5
CrossesPacific Ave
Location3.4 N JCT US 101
RouteInterstate 5
Coordinates47.04114, -122.85242
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 rating51 US tons
Inventory rating31 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length351 ft (107 m)
Longest span130 ft (39.6 m)
Deck width141 ft (43 m)
Roadway width134 ft (40.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic59,814 (2023)
Projected traffic91,181 by 2039
Trucks10%
Lanes on structure8
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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$22.7 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 over Pacific Ave built?

It was built in 1957, making it 68 years old in 2025. It was reconstructed in 1987.

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

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

About 59,814 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is I-5 over Pacific Ave?

The structure is 351 ft (107 m) long with a longest span of 130 ft (39.6 m) and a deck 141 ft wide.

Who owns I-5 over Pacific Ave?

It is owned by the State Highway Agency.