US Bridges

Whitman RD over N.F. Stillaguamish River

FairPosted for load

Snohomish County, Washington · 0.1 N JCT SR 530 · Structure no. 081038000000000

Built
1980
45 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
230 ft
2 main spans
Daily traffic
149
2022 count
Owner
County
County Highway Agency

About this bridge

Whitman RD over N.F. Stillaguamish River is a prestressed concrete continuous stringer/multi-beam or girder carrying Whitman RD over N.F. Stillaguamish River in Snohomish County, Washington. It was built in 1980, so it is 45 years old, younger 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. Its operating status is: posted for load restriction.

It carries about 149 vehicles a day, roughly 24% of them trucks, projected to reach 400 by 2040. The structure is 230 ft (70.1 m) long and 29 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesWhitman RD
CrossesN.F. Stillaguamish River
Location0.1 N JCT SR 530
RouteCounty Highway 83800
CountySnohomish County
StateWashington
Coordinates48.27184, -121.88823
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusPosted for load 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating34 US tons
Inventory rating20 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2 (+1 approach)
Design loadHS 20
Structure length230 ft (70.1 m)
Longest span100 ft (30.5 m)
Deck width29 ft (8.8 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic149 (2022)
Projected traffic400 by 2040
Trucks24%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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$8.7 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Whitman RD over N.F. Stillaguamish River built?

It was built in 1980, making it 45 years old in 2025.

What condition is Whitman RD over N.F. Stillaguamish 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 May 2024.

How much traffic does Whitman RD over N.F. Stillaguamish River carry?

About 149 vehicles per day (2022 count), of which roughly 24% are trucks.

How long is Whitman RD over N.F. Stillaguamish River?

The structure is 230 ft (70.1 m) long with a longest span of 100 ft (30.5 m) and a deck 29 ft wide.

Who owns Whitman RD over N.F. Stillaguamish River?

It is owned by the County Highway Agency.