US Bridges

Diablo ST over Stetattle Creek

FairClosed to traffic

King County, Washington · Diable Bunkhouse Entrance · Structure no. 087458000000000

Built
1941
84 years old
Condition
Fair
inspected August 2022
Type
Truss - Thru
Steel
Length
95 ft
2 main spans
Daily traffic
300
2022 count
Owner
Local
Other Local Agency

About this bridge

Diablo ST over Stetattle Creek is a steel truss - thru carrying Diablo ST over Stetattle Creek in King County, Washington. It was built in 1941, so it is 84 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. Its operating status is: closed to all traffic.

It carries about 300 vehicles a day, roughly 15% of them trucks, projected to reach 400 by 2042. The structure is 95 ft (29 m) long and 14 ft wide.

Location

Open in Google Maps
CarriesDiablo ST
CrossesStetattle Creek
LocationDiable Bunkhouse Entrance
CountyKing County
StateWashington
Coordinates48.7172, -121.14976
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionAugust 2022
Inspection intervalevery 24 months
Operating statusClosed to all traffic
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry0: Immediate repair necessary to put back in service
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating87 US tons
Inventory rating52 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckOpen grating
Main spans2
Design loadUnknown
Structure length95 ft (29 m)
Longest span89 ft (27.1 m)
Deck width14 ft (4.3 m)
Roadway width13 ft (4 m)
Vertical clearance over deck19 ft (5.8 m)

Traffic and service

Average daily traffic300 (2022)
Projected traffic400 by 2042
Trucks15%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther Local Agency
Maintained byOther Local Agency
Historic statusHistorical significance not determinable at this time
Work proposedDeck rehabilitation with only incidental widening
Estimated improvement cost$993,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Diablo ST over Stetattle Creek built?

It was built in 1941, making it 84 years old in 2025.

What condition is Diablo ST over Stetattle 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 August 2022.

How much traffic does Diablo ST over Stetattle Creek carry?

About 300 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is Diablo ST over Stetattle Creek?

The structure is 95 ft (29 m) long with a longest span of 89 ft (27.1 m) and a deck 14 ft wide.

Who owns Diablo ST over Stetattle Creek?

It is owned by the Other Local Agency.