US Bridges

I-5 over Deschutes Parkway

Fair

Thurston County, Washington · 5.0 N JCT SR 121 · Structure no. 0005129A0000000

Built
1956
69 years old, rebuilt 1990
Condition
Fair
inspected November 2023
Type
Box Beam or Girders - Multiple
Concrete
Length
118 ft
1 main span
Daily traffic
49,410
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 over Deschutes Parkway is a concrete box beam or girders - multiple carrying I-5 over Deschutes Parkway in Thurston County, Washington. It was built in 1956 and reconstructed in 1990, so it is 69 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 5 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 49,410 vehicles a day, roughly 13% of them trucks, projected to reach 76,937 by 2039. The structure is 118 ft (36 m) long and 145 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesI-5
CrossesDeschutes Parkway
Location5.0 N JCT SR 121
RouteInterstate 5
CountyThurston County
StateWashington
Coordinates47.02083, -122.90633
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28.5 US tons
Inventory rating22.2 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length118 ft (36 m)
Longest span115 ft (35.1 m)
Deck width145 ft (44.3 m)
Roadway width144 ft (43.8 m)
Vertical clearance over deck16 ft (5 m)

Traffic and service

Average daily traffic49,410 (2023)
Projected traffic76,937 by 2039
Trucks13%
Lanes on structure7
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 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$6.7 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 over Deschutes Parkway built?

It was built in 1956, making it 69 years old in 2025. It was reconstructed in 1990.

What condition is I-5 over Deschutes Parkway 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 I-5 over Deschutes Parkway carry?

About 49,410 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is I-5 over Deschutes Parkway?

The structure is 118 ft (36 m) long with a longest span of 115 ft (35.1 m) and a deck 145 ft wide.

Who owns I-5 over Deschutes Parkway?

It is owned by the State Highway Agency.