US Bridges

N-N Ramp over I-5

Good

Pierce County, Washington · JCT SR 16 · Structure no. 0017594A0000000

Built
2011
14 years old
Condition
Good
inspected June 2023
Type
Segmental Box Girder
Prestressed Concrete
Length
1,061 ft
4 main spans
Daily traffic
46,602
2023 count
Owner
State
State Highway Agency

About this bridge

N-N Ramp over I-5 is a prestressed concrete segmental box girder carrying N-N Ramp over I-5 in Pierce County, Washington. It was built in 2011, so it is 14 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 46,602 vehicles a day, roughly 5% of them trucks, projected to reach 63,839 by 2039. The structure is 1,061 ft (323.4 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesN-N Ramp
CrossesI-5
LocationJCT SR 16
RouteState Highway 5
CountyPierce County
StateWashington
Coordinates47.2285, -122.46111
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating36 US tons

Structure

Structure typeSegmental Box Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHL 93
Structure length1,061 ft (323.4 m)
Longest span295 ft (89.9 m)
Deck width45 ft (13.7 m)
Roadway width43 ft (13.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic46,602 (2023)
Projected traffic63,839 by 2039
Trucks5%
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 NetworkSTRAHNET connector

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$22.7 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was N-N Ramp over I-5 built?

It was built in 2011, making it 14 years old in 2025.

What condition is N-N Ramp over I-5 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 June 2023.

How much traffic does N-N Ramp over I-5 carry?

About 46,602 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is N-N Ramp over I-5?

The structure is 1,061 ft (323.4 m) long with a longest span of 295 ft (89.9 m) and a deck 45 ft wide.

Who owns N-N Ramp over I-5?

It is owned by the State Highway Agency.