US Bridges

Preston Fall City over Raging River

Fair

King County, Washington · 2.0 MI NE of 1-90 · Structure no. 083665000000000

Built
1962
63 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
170 ft
3 main spans
Daily traffic
9,212
2023 count
Owner
County
County Highway Agency

About this bridge

Preston Fall City over Raging River is a prestressed concrete stringer/multi-beam or girder carrying Preston Fall City over Raging River in King County, Washington. It was built in 1962, so it is 63 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 6 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 9,212 vehicles a day, roughly 5% of them trucks, projected to reach 9,750 by 2023. The structure is 170 ft (51.8 m) long and 34 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesPreston Fall City
CrossesRaging River
Location2.0 MI NE of 1-90
RouteCounty Highway 98906
CountyKing County
StateWashington
Coordinates47.54151, -121.90659
Functional classRural Minor Arterial

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating24.3 US tons
Inventory rating12.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length170 ft (51.8 m)
Longest span79 ft (24.1 m)
Deck width34 ft (10.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,212 (2023)
Projected traffic9,750 by 2023
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$6.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Preston Fall City over Raging River built?

It was built in 1962, making it 63 years old in 2025.

What condition is Preston Fall City over Raging River 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 July 2023.

How much traffic does Preston Fall City over Raging River carry?

About 9,212 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Preston Fall City over Raging River?

The structure is 170 ft (51.8 m) long with a longest span of 79 ft (24.1 m) and a deck 34 ft wide.

Who owns Preston Fall City over Raging River?

It is owned by the County Highway Agency.