US Bridges

Military Road over S-W Ramp to S 188th ST

Fair

King County, Washington · 3.3 N JCT SR 516 · Structure no. 0007459A0000000

Built
1964
61 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
227 ft
4 main spans
Daily traffic
14,741
2020 count
Owner
State
State Highway Agency

About this bridge

Military Road over S-W Ramp to S 188th ST is a prestressed concrete stringer/multi-beam or girder carrying Military Road over S-W Ramp to S 188th ST in King County, Washington. It was built in 1964, so it is 61 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 14,741 vehicles a day, roughly 14% of them trucks, projected to reach 22,780 by 2040. The structure is 227 ft (69.2 m) long and 33 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesMilitary Road
CrossesS-W Ramp to S 188th ST
Location3.3 N JCT SR 516
RouteCity Street 0
CountyKing County
StateWashington
Coordinates47.43417, -122.27122
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 inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating84 US tons
Inventory rating48.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length227 ft (69.2 m)
Longest span68 ft (20.7 m)
Deck width33 ft (10 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,741 (2020)
Projected traffic22,780 by 2040
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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$3.5 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Military Road over S-W Ramp to S 188th ST built?

It was built in 1964, making it 61 years old in 2025.

What condition is Military Road over S-W Ramp to S 188th 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 October 2024.

How much traffic does Military Road over S-W Ramp to S 188th ST carry?

About 14,741 vehicles per day (2020 count), of which roughly 14% are trucks.

How long is Military Road over S-W Ramp to S 188th ST?

The structure is 227 ft (69.2 m) long with a longest span of 68 ft (20.7 m) and a deck 33 ft wide.

Who owns Military Road over S-W Ramp to S 188th ST?

It is owned by the State Highway Agency.