US Bridges

N.W. Juniper St. over Issaquah Creek

Good

King County, Washington · 0.3 W of Front St. N. · Structure no. 087272000000000

Built
2005
20 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
102 ft
1 main span
Daily traffic
2,800
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

N.W. Juniper St. over Issaquah Creek is a prestressed concrete stringer/multi-beam or girder carrying N.W. Juniper St. over Issaquah Creek in King County, Washington. It was built in 2005, so it is 20 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 2,800 vehicles a day, roughly 5% of them trucks, projected to reach 3,350 by 2043. The structure is 102 ft (31.1 m) long and 53 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesN.W. Juniper St.
CrossesIssaquah Creek
Location0.3 W of Front St. N.
RouteCity Street 590
CountyKing County
StateWashington
Coordinates47.53922, -122.04311
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating21.8 US tons
Inventory rating9.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 25 or greater
Structure length102 ft (31.1 m)
Longest span99 ft (30.2 m)
Deck width53 ft (16.3 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,800 (2021)
Projected traffic3,350 by 2043
Trucks5%
Lanes on structure3
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 statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$4.5 million (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was N.W. Juniper St. over Issaquah Creek built?

It was built in 2005, making it 20 years old in 2025.

What condition is N.W. Juniper St. over Issaquah 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 September 2023.

How much traffic does N.W. Juniper St. over Issaquah Creek carry?

About 2,800 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is N.W. Juniper St. over Issaquah Creek?

The structure is 102 ft (31.1 m) long with a longest span of 99 ft (30.2 m) and a deck 53 ft wide.

Who owns N.W. Juniper St. over Issaquah Creek?

It is owned by the City or Municipal Highway Agency.