US Bridges

Road over Snow Creek

Poor

King County, Washington · 1.1 MI W of 54/50 JCT · Structure no. 060505000001527

Built
1979
46 years old
Condition
Poor
inspected September 2023
Type
Slab
Prestressed Concrete
Length
51 ft
1 main span
Daily traffic
27
1991 count
Owner
Federal
U.S. Forest Service

About this bridge

Road over Snow Creek is a prestressed concrete slab carrying Road over Snow Creek in King County, Washington. It was built in 1979, so it is 46 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 27 vehicles a day, projected to reach 40 by 2045. The structure is 51 ft (15.5 m) long and 17 ft wide. If it were closed, the detour would be 20.5 mi (33 km).

CarriesRoad
CrossesSnow Creek
Location1.1 MI W of 54/50 JCT
RouteFederal Lands Road 50
Coordinates47.26472, -121.40972
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating100.1 US tons
Inventory rating60.1 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadH 20
Structure length51 ft (15.5 m)
Longest span49 ft (14.8 m)
Deck width17 ft (5.2 m)
Roadway width14 ft (4.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27 (1991)
Projected traffic40 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed20.5 mi (33 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 Road over Snow Creek built?

It was built in 1979, making it 46 years old in 2025.

What condition is Road over Snow Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2023.

How much traffic does Road over Snow Creek carry?

About 27 vehicles per day (1991 count).

How long is Road over Snow Creek?

The structure is 51 ft (15.5 m) long with a longest span of 49 ft (14.8 m) and a deck 17 ft wide.

Who owns Road over Snow Creek?

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