US Bridges

229th Drive SE over Issaquah Creek

Fair

King County, Washington · 0.5 MI S of SE May Vly RD · Structure no. 079627000000000

Built
1983
42 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
42 ft
1 main span
Daily traffic
90
2019 count
Owner
County
County Highway Agency

About this bridge

229th Drive SE over Issaquah Creek is a wood or timber stringer/multi-beam or girder carrying 229th Drive SE over Issaquah Creek in King County, Washington. It was built in 1983, so it is 42 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 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 90 vehicles a day, projected to reach 170 by 2039. The structure is 42 ft (12.8 m) long and 35 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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Carries229th Drive SE
CrossesIssaquah Creek
Location0.5 MI S of SE May Vly RD
RouteCounty Highway 81873
CountyKing County
StateWashington
Coordinates47.47616, -122.03498
Functional classRural 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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating32 US tons
Inventory rating24 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length42 ft (12.8 m)
Longest span42 ft (12.8 m)
Deck width35 ft (10.7 m)
Roadway width29 ft (8.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic90 (2019)
Projected traffic170 by 2039
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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$1.9 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 229th Drive SE over Issaquah Creek built?

It was built in 1983, making it 42 years old in 2025.

What condition is 229th Drive SE 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 229th Drive SE over Issaquah Creek carry?

About 90 vehicles per day (2019 count).

How long is 229th Drive SE over Issaquah Creek?

The structure is 42 ft (12.8 m) long with a longest span of 42 ft (12.8 m) and a deck 35 ft wide.

Who owns 229th Drive SE over Issaquah Creek?

It is owned by the County Highway Agency.