US Bridges

I-5 over Owr N RR

Fair

Thurston County, Washington · 1.0 N JCT US 101 · Structure no. 0005285A0000000

Built
1957
68 years old, rebuilt 1986
Condition
Fair
inspected September 2024
Type
Slab
Concrete
Length
63 ft
1 main span
Daily traffic
69,477
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 over Owr N RR is a concrete slab carrying I-5 over Owr N RR in Thurston County, Washington. It was built in 1957 and reconstructed in 1986, 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 69,477 vehicles a day, roughly 10% of them trucks, projected to reach 105,910 by 2039. The structure is 63 ft (19.2 m) long and 160 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesI-5
CrossesOwr N RR
Location1.0 N JCT US 101
RouteInterstate 5
Coordinates47.0285, -122.89531
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.1 US tons
Inventory rating40 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length63 ft (19.2 m)
Longest span57 ft (17.4 m)
Deck width160 ft (48.8 m)
Roadway width152 ft (46.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic69,477 (2023)
Projected traffic105,910 by 2039
Trucks10%
Lanes on structure8
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed8.1 mi (13 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$4.6 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 over Owr N RR built?

It was built in 1957, making it 68 years old in 2025. It was reconstructed in 1986.

What condition is I-5 over Owr N RR 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 Owr N RR carry?

About 69,477 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is I-5 over Owr N RR?

The structure is 63 ft (19.2 m) long with a longest span of 57 ft (17.4 m) and a deck 160 ft wide.

Who owns I-5 over Owr N RR?

It is owned by the State Highway Agency.