US Bridges

N.W.Dogwood ST over Issaquah Ck

Good

King County, Washington · 0.2W Front ST · Structure no. 088758000000000

Built
2015
10 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
95 ft
1 main span
Daily traffic
4,500
2019 count
Owner
City
City or Municipal Highway Agency

About this bridge

N.W.Dogwood ST over Issaquah Ck is a prestressed concrete stringer/multi-beam or girder carrying N.W.Dogwood ST over Issaquah Ck in King County, Washington. It was built in 2015, so it is 10 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,500 vehicles a day, roughly 5% of them trucks, projected to reach 8,100 by 2038. The structure is 95 ft (29 m) long and 48 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesN.W.Dogwood ST
CrossesIssaquah Ck
Location0.2W Front ST
RouteCity Street 590
CountyKing County
StateWashington
Coordinates47.53382, -122.04044
Functional classUrban Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55 US tons
Inventory rating37.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHL 93
Structure length95 ft (29 m)
Longest span94 ft (28.7 m)
Deck width48 ft (14.6 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,500 (2019)
Projected traffic8,100 by 2038
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$3.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was N.W.Dogwood ST over Issaquah Ck built?

It was built in 2015, making it 10 years old in 2025.

What condition is N.W.Dogwood ST over Issaquah Ck 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 September 2023.

How much traffic does N.W.Dogwood ST over Issaquah Ck carry?

About 4,500 vehicles per day (2019 count), of which roughly 5% are trucks.

How long is N.W.Dogwood ST over Issaquah Ck?

The structure is 95 ft (29 m) long with a longest span of 94 ft (28.7 m) and a deck 48 ft wide.

Who owns N.W.Dogwood ST over Issaquah Ck?

It is owned by the City or Municipal Highway Agency.