US Bridges

SE 156th ST over Issaquah Creek

Fair

King County, Washington · 2 MI E of SR-169 · Structure no. 083023000000000

Built
1952
73 years old
Condition
Fair
inspected September 2024
Type
Channel Beam
Concrete
Length
40 ft
2 main spans
Daily traffic
253
2024 count
Owner
County
County Highway Agency

About this bridge

SE 156th ST over Issaquah Creek is a concrete channel beam carrying SE 156th ST over Issaquah Creek in King County, Washington. It was built in 1952, so it is 73 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 5 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 253 vehicles a day, projected to reach 400 by 2039. The structure is 40 ft (12.2 m) long and 24 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSE 156th ST
CrossesIssaquah Creek
Location2 MI E of SR-169
RouteCounty Highway 80600
CountyKing County
StateWashington
Coordinates47.46212, -122.02507
Functional classUrban Local

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating23.3 US tons
Inventory rating15.8 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans2
Design loadH 20
Structure length40 ft (12.2 m)
Longest span19 ft (5.8 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic253 (2024)
Projected traffic400 by 2039
Trucks0%
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

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SE 156th ST over Issaquah Creek built?

It was built in 1952, making it 73 years old in 2025.

What condition is SE 156th ST over Issaquah Creek 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 September 2024.

How much traffic does SE 156th ST over Issaquah Creek carry?

About 253 vehicles per day (2024 count).

How long is SE 156th ST over Issaquah Creek?

The structure is 40 ft (12.2 m) long with a longest span of 19 ft (5.8 m) and a deck 24 ft wide.

Who owns SE 156th ST over Issaquah Creek?

It is owned by the County Highway Agency.