US Bridges

I-705 over 15th ST Vacated RR

Good

Pierce County, Washington · 1.1 N JCT I-5 · Structure no. 0012747B0000000

Built
1987
38 years old
Condition
Good
inspected November 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
1,245 ft
9 main spans
Daily traffic
26,174
2023 count
Owner
State
State Highway Agency

About this bridge

I-705 over 15th ST Vacated RR is a prestressed concrete continuous box beam or girders - multiple carrying I-705 over 15th ST Vacated RR in Pierce County, Washington. It was built in 1987, so it is 38 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 26,174 vehicles a day, roughly 4% of them trucks, projected to reach 39,077 by 2039. The structure is 1,245 ft (379.5 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI-705
Crosses15th ST Vacated RR
Location1.1 N JCT I-5
RouteInterstate 705
Coordinates47.24889, -122.43583
Functional classUrban Principal Arterial - Interstate

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 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37 US tons
Inventory rating22 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans9
Design loadHS 20 + Mod
Structure length1,245 ft (379.5 m)
Longest span150 ft (45.7 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26,174 (2023)
Projected traffic39,077 by 2039
Trucks4%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$24.8 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-705 over 15th ST Vacated RR built?

It was built in 1987, making it 38 years old in 2025.

What condition is I-705 over 15th ST Vacated RR 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 2024.

How much traffic does I-705 over 15th ST Vacated RR carry?

About 26,174 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is I-705 over 15th ST Vacated RR?

The structure is 1,245 ft (379.5 m) long with a longest span of 150 ft (45.7 m) and a deck 43 ft wide.

Who owns I-705 over 15th ST Vacated RR?

It is owned by the State Highway Agency.