US Bridges

SR 599 over 133rd ST

Fair

King County, Washington · 0.3 N JCT I-5 · Structure no. 0007956B0000000

Built
1966
59 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
141 ft
3 main spans
Daily traffic
22,284
2023 count
Owner
State
State Highway Agency

About this bridge

SR 599 over 133rd ST is a prestressed concrete stringer/multi-beam or girder carrying SR 599 over 133rd ST in King County, Washington. It was built in 1966, so it is 59 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 22,284 vehicles a day, roughly 10% of them trucks, projected to reach 35,192 by 2039. The structure is 141 ft (43 m) long and 39 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSR 599
Crosses133rd ST
Location0.3 N JCT I-5
RouteState Highway 599
CountyKing County
StateWashington
Coordinates47.48567, -122.27533
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 rating60 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length141 ft (43 m)
Longest span64 ft (19.5 m)
Deck width39 ft (12 m)
Roadway width36 ft (11.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,284 (2023)
Projected traffic35,192 by 2039
Trucks10%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 SR 599 over 133rd ST built?

It was built in 1966, making it 59 years old in 2025.

What condition is SR 599 over 133rd ST 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 SR 599 over 133rd ST carry?

About 22,284 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is SR 599 over 133rd ST?

The structure is 141 ft (43 m) long with a longest span of 64 ft (19.5 m) and a deck 39 ft wide.

Who owns SR 599 over 133rd ST?

It is owned by the State Highway Agency.