US Bridges

I-705 N-W Ramp over 15th St-Plrr I-705

Good

Pierce County, Washington · 0.9 N JCT I-5 · Structure no. 0012648A0000000

Built
1987
38 years old
Condition
Good
inspected November 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
1,246 ft
8 main spans
Daily traffic
10,307
2012 count
Owner
State
State Highway Agency

About this bridge

I-705 N-W Ramp over 15th St-Plrr I-705 is a prestressed concrete continuous box beam or girders - multiple carrying I-705 N-W Ramp over 15th St-Plrr I-705 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 10,307 vehicles a day, roughly 3% of them trucks, projected to reach 17,728 by 2036. The structure is 1,246 ft (379.9 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesI-705 N-W Ramp
Crosses15th St-Plrr I-705
Location0.9 N JCT I-5
RouteInterstate 705
CountyPierce County
StateWashington
Coordinates47.24665, -122.43532
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 evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating99 US tons
Inventory rating59 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans8 (+3 approach)
Design loadHS 20 + Mod
Structure length1,246 ft (379.9 m)
Longest span148 ft (45.1 m)
Deck width32 ft (9.8 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,307 (2012)
Projected traffic17,728 by 2036
Trucks3%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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$23.7 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-705 N-W Ramp over 15th St-Plrr I-705 built?

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

What condition is I-705 N-W Ramp over 15th St-Plrr I-705 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 N-W Ramp over 15th St-Plrr I-705 carry?

About 10,307 vehicles per day (2012 count), of which roughly 3% are trucks.

How long is I-705 N-W Ramp over 15th St-Plrr I-705?

The structure is 1,246 ft (379.9 m) long with a longest span of 148 ft (45.1 m) and a deck 32 ft wide.

Who owns I-705 N-W Ramp over 15th St-Plrr I-705?

It is owned by the State Highway Agency.