US Bridges

35th Ave NE over Thorton Creek

Good

King County, Washington · 0.5 Mile East of SR 522 · Structure no. 088747000000000

Built
2014
11 years old
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
37 ft
1 main span
Daily traffic
13,900
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

35th Ave NE over Thorton Creek is a prestressed concrete stringer/multi-beam or girder carrying 35th Ave NE over Thorton Creek in King County, Washington. It was built in 2014, so it is 11 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 13,900 vehicles a day, roughly 5% of them trucks, projected to reach 20,000 by 2038. The structure is 37 ft (11.3 m) long and 61 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Carries35th Ave NE
CrossesThorton Creek
Location0.5 Mile East of SR 522
RouteCity Street 1140
Coordinates47.70703, -122.29081
Functional classUrban Minor Arterial

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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.8 US tons
Inventory rating48.6 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length37 ft (11.3 m)
Longest span37 ft (11.3 m)
Deck width61 ft (18.6 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,900 (2023)
Projected traffic20,000 by 2038
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedDeck replacement with only incidental widening
Estimated improvement cost$668,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 35th Ave NE over Thorton Creek built?

It was built in 2014, making it 11 years old in 2025.

What condition is 35th Ave NE over Thorton Creek 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 March 2023.

How much traffic does 35th Ave NE over Thorton Creek carry?

About 13,900 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is 35th Ave NE over Thorton Creek?

The structure is 37 ft (11.3 m) long with a longest span of 37 ft (11.3 m) and a deck 61 ft wide.

Who owns 35th Ave NE over Thorton Creek?

It is owned by the City or Municipal Highway Agency.