US Bridges

SR 18 Ramp over Holder CR & Hobart RD

Fair

King County, Washington · 4.6 E JCT SR 169 · Structure no. 0014567G0000000

Built
1996
29 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
344 ft
4 main spans
Daily traffic
935
2023 count
Owner
State
State Highway Agency

About this bridge

SR 18 Ramp over Holder CR & Hobart RD is a prestressed concrete continuous stringer/multi-beam or girder carrying SR 18 Ramp over Holder CR & Hobart RD in King County, Washington. It was built in 1996, so it is 29 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 935 vehicles a day, roughly 11% of them trucks, projected to reach 1,354 by 2039. The structure is 344 ft (104.9 m) long and 27 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSR 18 Ramp
CrossesHolder CR & Hobart RD
Location4.6 E JCT SR 169
RouteState Highway 18
CountyKing County
StateWashington
Coordinates47.43534, -121.97597
Functional classRural Principal Arterial - Other

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.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating91.9 US tons
Inventory rating55 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 25 or greater
Structure length344 ft (104.9 m)
Longest span104 ft (31.7 m)
Deck width27 ft (8.2 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic935 (2023)
Projected traffic1,354 by 2039
Trucks11%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
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$4.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 18 Ramp over Holder CR & Hobart RD built?

It was built in 1996, making it 29 years old in 2025.

What condition is SR 18 Ramp over Holder CR & Hobart 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 March 2024.

How much traffic does SR 18 Ramp over Holder CR & Hobart RD carry?

About 935 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is SR 18 Ramp over Holder CR & Hobart RD?

The structure is 344 ft (104.9 m) long with a longest span of 104 ft (31.7 m) and a deck 27 ft wide.

Who owns SR 18 Ramp over Holder CR & Hobart RD?

It is owned by the State Highway Agency.