US Bridges

Coal Creek Pkwy over May Creek

Fair

King County, Washington · 0.25 MI N of SE 95th Way · Structure no. 088025000000000

Built
2009
16 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
290 ft
1 main span
Daily traffic
32,000
2019 count
Owner
City
City or Municipal Highway Agency

About this bridge

Coal Creek Pkwy over May Creek is a prestressed concrete stringer/multi-beam or girder carrying Coal Creek Pkwy over May Creek in King County, Washington. It was built in 2009, so it is 16 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 32,000 vehicles a day, roughly 5% of them trucks, projected to reach 40,000 by 2039. The structure is 290 ft (88.4 m) long and 82 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesCoal Creek Pkwy
CrossesMay Creek
Location0.25 MI N of SE 95th Way
RouteCity Street 97850
CountyKing County
StateWashington
Coordinates47.51811, -122.15911
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.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 rating58.2 US tons
Inventory rating45 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20
Structure length290 ft (88.4 m)
Longest span110 ft (33.5 m)
Deck width82 ft (25 m)
Roadway width59 ft (18 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic32,000 (2019)
Projected traffic40,000 by 2039
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

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 rehabilitation with only incidental widening
Estimated improvement cost$8.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Coal Creek Pkwy over May Creek built?

It was built in 2009, making it 16 years old in 2025.

What condition is Coal Creek Pkwy over May 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 June 2023.

How much traffic does Coal Creek Pkwy over May Creek carry?

About 32,000 vehicles per day (2019 count), of which roughly 5% are trucks.

How long is Coal Creek Pkwy over May Creek?

The structure is 290 ft (88.4 m) long with a longest span of 110 ft (33.5 m) and a deck 82 ft wide.

Who owns Coal Creek Pkwy over May Creek?

It is owned by the City or Municipal Highway Agency.