US Bridges

SR 509 over I-705 Bnrr Dock Street

Good

Pierce County, Washington · JCT I-705 · Structure no. 0014747A0000000

Built
1996
29 years old
Condition
Good
inspected November 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
311 ft
3 main spans
Daily traffic
37,456
2023 count
Owner
State
State Highway Agency

About this bridge

SR 509 over I-705 Bnrr Dock Street is a prestressed concrete continuous box beam or girders - multiple carrying SR 509 over I-705 Bnrr Dock Street in Pierce County, Washington. It was built in 1996, so it is 29 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 37,456 vehicles a day, roughly 5% of them trucks, projected to reach 55,028 by 2039. The structure is 311 ft (94.8 m) long and 197 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSR 509
CrossesI-705 Bnrr Dock Street
LocationJCT I-705
RouteState Highway 509
Coordinates47.24322, -122.435
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating70 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length311 ft (94.8 m)
Longest span151 ft (46 m)
Deck width197 ft (59.9 m)
Roadway width112 ft (34.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic37,456 (2023)
Projected traffic55,028 by 2039
Trucks5%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed1.2 mi (2 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$12.9 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 509 over I-705 Bnrr Dock Street built?

It was built in 1996, making it 29 years old in 2025.

What condition is SR 509 over I-705 Bnrr Dock Street 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 November 2023.

How much traffic does SR 509 over I-705 Bnrr Dock Street carry?

About 37,456 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is SR 509 over I-705 Bnrr Dock Street?

The structure is 311 ft (94.8 m) long with a longest span of 151 ft (46 m) and a deck 197 ft wide.

Who owns SR 509 over I-705 Bnrr Dock Street?

It is owned by the State Highway Agency.