US Bridges

S 375th ST over I-5

Fair

King County, Washington · 0.7 N Pierce CO · Structure no. 0006094A0000000

Built
1959
66 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
301 ft
5 main spans
Daily traffic
516
2002 count
Owner
State
State Highway Agency

About this bridge

S 375th ST over I-5 is a prestressed concrete stringer/multi-beam or girder carrying S 375th ST over I-5 in King County, Washington. It was built in 1959, so it is 66 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 516 vehicles a day, roughly 1% of them trucks, projected to reach 902 by 2036. The structure is 301 ft (91.7 m) long and 34 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesS 375th ST
CrossesI-5
Location0.7 N Pierce CO
RouteCounty Highway 0
CountyKing County
StateWashington
Coordinates47.26544, -122.32261
Functional classUrban Collector

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 inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.9 US tons
Inventory rating37 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length301 ft (91.7 m)
Longest span70 ft (21.3 m)
Deck width34 ft (10.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic516 (2002)
Projected traffic902 by 2036
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

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$4.3 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was S 375th ST over I-5 built?

It was built in 1959, making it 66 years old in 2025.

What condition is S 375th ST 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 March 2024.

How much traffic does S 375th ST over I-5 carry?

About 516 vehicles per day (2002 count), of which roughly 1% are trucks.

How long is S 375th ST over I-5?

The structure is 301 ft (91.7 m) long with a longest span of 70 ft (21.3 m) and a deck 34 ft wide.

Who owns S 375th ST over I-5?

It is owned by the State Highway Agency.