US Bridges

No Data Entered over Slippery Creek Trib.

Good

King County, Washington · No Data Entered · Structure no. 060507000020650

Built
2010
15 years old
Condition
Good
inspected November 2022
Type
Stringer/Multi-beam or Girder
Steel
Length
70 ft
1 main span
Daily traffic
50
Owner
Federal
U.S. Forest Service

About this bridge

No Data Entered over Slippery Creek Trib. is a steel stringer/multi-beam or girder carrying No Data Entered over Slippery Creek Trib. in King County, Washington. It was built in 2010, so it is 15 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 50 vehicles a day, projected to reach 75 by 2045. The structure is 70 ft (21.4 m) long and 16 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

Location

Open in Google Maps
CarriesNo Data Entered
CrossesSlippery Creek Trib.
LocationNo Data Entered
RouteFederal Lands Road 71250
CountyKing County
StateWashington
Coordinates47.16992, -121.66212
Functional classRural Local

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, precast panels
Main spans1
Design loadOther
Structure length70 ft (21.4 m)
Longest span69 ft (21 m)
Deck width16 ft (5 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (—)
Projected traffic75 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.2 mi (158 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was No Data Entered over Slippery Creek Trib. built?

It was built in 2010, making it 15 years old in 2025.

What condition is No Data Entered over Slippery Creek Trib. 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 November 2022.

How much traffic does No Data Entered over Slippery Creek Trib. carry?

About 50 vehicles per day (latest count).

How long is No Data Entered over Slippery Creek Trib.?

The structure is 70 ft (21.4 m) long with a longest span of 69 ft (21 m) and a deck 16 ft wide.

Who owns No Data Entered over Slippery Creek Trib.?

It is owned by the U.S. Forest Service.