US Bridges

SE May Valley Road over May Creek

Good

King County, Washington · 0.1 MI E of SR-900 · Structure no. 088234000000000

Built
2010
15 years old
Condition
Good
inspected May 2024
Type
Slab
Prestressed Concrete
Length
36 ft
1 main span
Daily traffic
6,018
2020 count
Owner
County
County Highway Agency

About this bridge

SE May Valley Road over May Creek is a prestressed concrete slab carrying SE May Valley Road over May Creek in King County, Washington. It was built in 2010, so it is 15 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 6,018 vehicles a day, roughly 4% of them trucks, projected to reach 8,000 by 2040. The structure is 36 ft (11 m) long and 43 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesSE May Valley Road
CrossesMay Creek
Location0.1 MI E of SR-900
RouteCounty Highway 6420
Coordinates47.49864, -122.0971
Functional classRural 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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable 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 rating100.3 US tons
Inventory rating77.5 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length36 ft (11 m)
Longest span30 ft (9.1 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,018 (2020)
Projected traffic8,000 by 2040
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$718,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SE May Valley Road over May Creek built?

It was built in 2010, making it 15 years old in 2025.

What condition is SE May Valley Road 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 May 2024.

How much traffic does SE May Valley Road over May Creek carry?

About 6,018 vehicles per day (2020 count), of which roughly 4% are trucks.

How long is SE May Valley Road over May Creek?

The structure is 36 ft (11 m) long with a longest span of 30 ft (9.1 m) and a deck 43 ft wide.

Who owns SE May Valley Road over May Creek?

It is owned by the County Highway Agency.