US Bridges

N 40th Place over May Creek

Good

King County, Washington · 0.2 MI W of I-405 · Structure no. 088155000000000

Built
2007
18 years old
Condition
Good
inspected June 2023
Type
Tee Beam
Prestressed Concrete
Length
86 ft
1 main span
Daily traffic
165
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

N 40th Place over May Creek is a prestressed concrete tee beam carrying N 40th Place over May Creek in King County, Washington. It was built in 2007, so it is 18 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 165 vehicles a day, roughly 20% of them trucks, projected to reach 400 by 2043. The structure is 86 ft (26.2 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesN 40th Place
CrossesMay Creek
Location0.2 MI W of I-405
RouteCity Street 1070
Coordinates47.52851, -122.20416
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.4 US tons
Inventory rating52.1 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHL 93
Structure length86 ft (26.2 m)
Longest span81 ft (24.7 m)
Deck width40 ft (12.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic165 (2023)
Projected traffic400 by 2043
Trucks20%
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

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$3.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was N 40th Place over May Creek built?

It was built in 2007, making it 18 years old in 2025.

What condition is N 40th Place over May 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 June 2023.

How much traffic does N 40th Place over May Creek carry?

About 165 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is N 40th Place over May Creek?

The structure is 86 ft (26.2 m) long with a longest span of 81 ft (24.7 m) and a deck 40 ft wide.

Who owns N 40th Place over May Creek?

It is owned by the City or Municipal Highway Agency.