US Bridges

Ramp to I-5 Nb/Sb over City Sts Ramp & RR

Fair

King County, Washington · 3.8 N JCT SR 900 · Structure no. 0007882A0000000

Built
1966
59 years old
Condition
Fair
inspected May 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
938 ft
11 main spans
Daily traffic
23,338
2020 count
Owner
State
State Highway Agency

About this bridge

Ramp to I-5 Nb/Sb over City Sts Ramp & RR is a concrete continuous box beam or girders - multiple carrying Ramp to I-5 Nb/Sb over City Sts Ramp & RR 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 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 23,338 vehicles a day, roughly 5% of them trucks, projected to reach 40,544 by 2040. The structure is 938 ft (285.9 m) long and 34 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesRamp to I-5 Nb/Sb
CrossesCity Sts Ramp & RR
Location3.8 N JCT SR 900
RouteInterstate 5
CountyKing County
StateWashington
Coordinates47.54842, -122.31772
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56 US tons
Inventory rating33 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans11
Design loadHS 20
Structure length938 ft (285.9 m)
Longest span111 ft (33.8 m)
Deck width34 ft (10.4 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,338 (2020)
Projected traffic40,544 by 2040
Trucks5%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed3.7 mi (6 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$20.5 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Ramp to I-5 Nb/Sb over City Sts Ramp & RR built?

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

What condition is Ramp to I-5 Nb/Sb over City Sts Ramp & 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 May 2023.

How much traffic does Ramp to I-5 Nb/Sb over City Sts Ramp & RR carry?

About 23,338 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Ramp to I-5 Nb/Sb over City Sts Ramp & RR?

The structure is 938 ft (285.9 m) long with a longest span of 111 ft (33.8 m) and a deck 34 ft wide.

Who owns Ramp to I-5 Nb/Sb over City Sts Ramp & RR?

It is owned by the State Highway Agency.