US Bridges

SR 509 over Hylebos Creek

Good

Pierce County, Washington · 4.1 N JCT I-705 · Structure no. 084942000000000

Built
1967
58 years old, rebuilt 1994
Condition
Good
inspected February 2023
Type
Slab
Concrete
Length
97 ft
3 main spans
Daily traffic
22,574
2023 count
Owner
State
State Highway Agency

About this bridge

SR 509 over Hylebos Creek is a concrete slab carrying SR 509 over Hylebos Creek in Pierce County, Washington. It was built in 1967 and reconstructed in 1994, so it is 58 years old, older 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 22,574 vehicles a day, roughly 5% of them trucks, projected to reach 33,163 by 2039. The structure is 97 ft (29.6 m) long and 65 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesSR 509
CrossesHylebos Creek
Location4.1 N JCT I-705
RouteState Highway 509
Coordinates47.25886, -122.35744
Functional classUrban Other Principal 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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69 US tons
Inventory rating41 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length97 ft (29.6 m)
Longest span34 ft (10.4 m)
Deck width65 ft (19.9 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,574 (2023)
Projected traffic33,163 by 2039
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 509 over Hylebos Creek built?

It was built in 1967, making it 58 years old in 2025. It was reconstructed in 1994.

What condition is SR 509 over Hylebos 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 February 2023.

How much traffic does SR 509 over Hylebos Creek carry?

About 22,574 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is SR 509 over Hylebos Creek?

The structure is 97 ft (29.6 m) long with a longest span of 34 ft (10.4 m) and a deck 65 ft wide.

Who owns SR 509 over Hylebos Creek?

It is owned by the State Highway Agency.