US Bridges

SE 24th ST over Wetland

Fair

King County, Washington · 0.6 MI E of 228th Ave SE · Structure no. 079979000000000

Built
1968
57 years old, rebuilt 1994
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
389 ft
25 main spans
Daily traffic
6,000
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

SE 24th ST over Wetland is a wood or timber stringer/multi-beam or girder carrying SE 24th ST over Wetland in King County, Washington. It was built in 1968 and reconstructed in 1994, so it is 57 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 6,000 vehicles a day, roughly 5% of them trucks, projected to reach 9,700 by 2041. The structure is 389 ft (118.6 m) long and 40 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesSE 24th ST
CrossesWetland
Location0.6 MI E of 228th Ave SE
RouteCounty Highway 84680
CountyKing County
StateWashington
Coordinates47.58814, -122.02442
Functional classUrban Collector

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.
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 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating43.5 US tons
Inventory rating26.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckClosed grating
Main spans25
Design loadHS 20
Structure length389 ft (118.6 m)
Longest span16 ft (4.9 m)
Deck width40 ft (12.2 m)
Roadway width35 ft (10.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,000 (2021)
Projected traffic9,700 by 2041
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

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$14.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SE 24th ST over Wetland built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 1994.

What condition is SE 24th ST over Wetland 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 2023.

How much traffic does SE 24th ST over Wetland carry?

About 6,000 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is SE 24th ST over Wetland?

The structure is 389 ft (118.6 m) long with a longest span of 16 ft (4.9 m) and a deck 40 ft wide.

Who owns SE 24th ST over Wetland?

It is owned by the City or Municipal Highway Agency.