US Bridges

Issaquah-Hobart RD over Holder Creek

Good

King County, Washington · 4.6 E JCT SR 169 · Structure no. 0014567H0000000

Built
1996
29 years old
Condition
Good
inspected May 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
70 ft
1 main span
Daily traffic
8,691
2010 count
Owner
State
State Highway Agency

About this bridge

Issaquah-Hobart RD over Holder Creek is a prestressed concrete stringer/multi-beam or girder carrying Issaquah-Hobart RD over Holder Creek 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 8,691 vehicles a day, roughly 5% of them trucks, projected to reach 13,662 by 2036. The structure is 70 ft (21.3 m) long and 43 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesIssaquah-Hobart RD
CrossesHolder Creek
Location4.6 E JCT SR 169
RouteCounty Highway 18
CountyKing County
StateWashington
Coordinates47.43453, -121.97308
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating90.9 US tons
Inventory rating55 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length70 ft (21.3 m)
Longest span65 ft (19.8 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,691 (2010)
Projected traffic13,662 by 2036
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Issaquah-Hobart RD over Holder Creek built?

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

What condition is Issaquah-Hobart RD over Holder Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2022.

How much traffic does Issaquah-Hobart RD over Holder Creek carry?

About 8,691 vehicles per day (2010 count), of which roughly 5% are trucks.

How long is Issaquah-Hobart RD over Holder Creek?

The structure is 70 ft (21.3 m) long with a longest span of 65 ft (19.8 m) and a deck 43 ft wide.

Who owns Issaquah-Hobart RD over Holder Creek?

It is owned by the State Highway Agency.