US Bridges

I-5 over Military RD

Fair

King County, Washington · 4.4 N JCT SR 18 · Structure no. 0006207A0000000

Built
1960
65 years old, rebuilt 2002
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
243 ft
3 main spans
Daily traffic
98,173
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 over Military RD is a prestressed concrete stringer/multi-beam or girder carrying I-5 over Military RD in King County, Washington. It was built in 1960 and reconstructed in 2002, so it is 65 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 98,173 vehicles a day, roughly 7% of them trucks, projected to reach 140,916 by 2039. The structure is 243 ft (74.1 m) long and 97 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-5
CrossesMilitary RD
Location4.4 N JCT SR 18
RouteInterstate 5
CountyKing County
StateWashington
Coordinates47.35184, -122.29587
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.
Substructure7 GoodSome minor problems.
Last inspectionOctober 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 rating82 US tons
Inventory rating47 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length243 ft (74.1 m)
Longest span78 ft (23.8 m)
Deck width97 ft (29.7 m)
Roadway width96 ft (29.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic98,173 (2023)
Projected traffic140,916 by 2039
Trucks7%
Lanes on structure5
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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$11.3 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 over Military RD built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 2002.

What condition is I-5 over Military RD 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 October 2024.

How much traffic does I-5 over Military RD carry?

About 98,173 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is I-5 over Military RD?

The structure is 243 ft (74.1 m) long with a longest span of 78 ft (23.8 m) and a deck 97 ft wide.

Who owns I-5 over Military RD?

It is owned by the State Highway Agency.