US Bridges

Cathcart Way over Thomas Creek

Fair

Snohomish County, Washington · 4.5 E JCT I5 · Structure no. 086519000000000

Built
2000
25 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
127 ft
1 main span
Daily traffic
16,353
2020 count
Owner
County
County Highway Agency

About this bridge

Cathcart Way over Thomas Creek is a prestressed concrete stringer/multi-beam or girder carrying Cathcart Way over Thomas Creek in Snohomish County, Washington. It was built in 2000, so it is 25 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.

It carries about 16,353 vehicles a day, roughly 8% of them trucks, projected to reach 30,000 by 2040. The structure is 127 ft (38.6 m) long and 79 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesCathcart Way
CrossesThomas Creek
Location4.5 E JCT I5
RouteCounty Highway 93680
CountySnohomish County
StateWashington
Coordinates47.87152, -122.14018
Functional classUrban Other Principal 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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating96 US tons
Inventory rating55 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length127 ft (38.6 m)
Longest span120 ft (36.6 m)
Deck width79 ft (24.2 m)
Roadway width66 ft (20.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,353 (2020)
Projected traffic30,000 by 2040
Trucks8%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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$9.6 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Cathcart Way over Thomas Creek built?

It was built in 2000, making it 25 years old in 2025.

What condition is Cathcart Way over Thomas 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 May 2024.

How much traffic does Cathcart Way over Thomas Creek carry?

About 16,353 vehicles per day (2020 count), of which roughly 8% are trucks.

How long is Cathcart Way over Thomas Creek?

The structure is 127 ft (38.6 m) long with a longest span of 120 ft (36.6 m) and a deck 79 ft wide.

Who owns Cathcart Way over Thomas Creek?

It is owned by the County Highway Agency.