US Bridges

I-705 NB over I-705 NB Ramp Streets+

Fair

Pierce County, Washington · 0.3 N JCT I-5 · Structure no. 0012992B0000000

Built
1988
37 years old
Condition
Fair
inspected August 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
2,588 ft
18 main spans
Daily traffic
20,205
2023 count
Owner
State
State Highway Agency

About this bridge

I-705 NB over I-705 NB Ramp Streets+ is a prestressed concrete continuous box beam or girders - single or spread carrying I-705 NB over I-705 NB Ramp Streets+ in Pierce County, Washington. It was built in 1988, so it is 37 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 20,205 vehicles a day, roughly 4% of them trucks, projected to reach 30,166 by 2039. The structure is 2,588 ft (788.8 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-705 NB
CrossesI-705 NB Ramp Streets+
Location0.3 N JCT I-5
RouteInterstate 705
CountyPierce County
StateWashington
Coordinates47.23534, -122.43114
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2023
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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating33.2 US tons
Inventory rating25.7 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans18
Design loadHS 20 + Mod
Structure length2,588 ft (788.8 m)
Longest span170 ft (51.8 m)
Deck width41 ft (12.5 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,205 (2023)
Projected traffic30,166 by 2039
Trucks4%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
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$49.2 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-705 NB over I-705 NB Ramp Streets+ built?

It was built in 1988, making it 37 years old in 2025.

What condition is I-705 NB over I-705 NB Ramp Streets+ 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 August 2023.

How much traffic does I-705 NB over I-705 NB Ramp Streets+ carry?

About 20,205 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is I-705 NB over I-705 NB Ramp Streets+?

The structure is 2,588 ft (788.8 m) long with a longest span of 170 ft (51.8 m) and a deck 41 ft wide.

Who owns I-705 NB over I-705 NB Ramp Streets+?

It is owned by the State Highway Agency.