US Bridges

S Main ST over RR

Fair

King County, Washington · S Main ST 3rd - 4th Ave · Structure no. 085056000000000

Built
1982
43 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
130 ft
2 main spans
Daily traffic
2,300
2017 count
Owner
City
City or Municipal Highway Agency

About this bridge

S Main ST over RR is a prestressed concrete stringer/multi-beam or girder carrying S Main ST over RR in King County, Washington. It was built in 1982, so it is 43 years old, younger 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 2,300 vehicles a day, roughly 10% of them trucks, projected to reach 3,500 by 2043. The structure is 130 ft (39.6 m) long and 66 ft wide.

Location

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CarriesS Main ST
CrossesRR
LocationS Main ST 3rd - 4th Ave
RouteCity Street 1140
CountyKing County
StateWashington
Coordinates47.6, -122.32944
Functional classUrban Minor Arterial

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 inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57 US tons
Inventory rating6.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length130 ft (39.6 m)
Longest span76 ft (23.2 m)
Deck width66 ft (20.1 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,300 (2017)
Projected traffic3,500 by 2043
Trucks10%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
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 S Main ST over RR built?

It was built in 1982, making it 43 years old in 2025.

What condition is S Main ST over 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 July 2023.

How much traffic does S Main ST over RR carry?

About 2,300 vehicles per day (2017 count), of which roughly 10% are trucks.

How long is S Main ST over RR?

The structure is 130 ft (39.6 m) long with a longest span of 76 ft (23.2 m) and a deck 66 ft wide.

Who owns S Main ST over RR?

It is owned by the City or Municipal Highway Agency.