US Bridges

N-W Ramp over I-5

Good

Clark County, Washington · 0.3 N Oregon · Structure no. 0012156B0000000

Built
1983
42 years old
Condition
Good
inspected October 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
390 ft
3 main spans
Daily traffic
7,513
2023 count
Owner
State
State Highway Agency

About this bridge

N-W Ramp over I-5 is a prestressed concrete continuous box beam or girders - multiple carrying N-W Ramp over I-5 in Clark County, Washington. It was built in 1983, so it is 42 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 7,513 vehicles a day, roughly 15% of them trucks, projected to reach 13,459 by 2039. The structure is 390 ft (118.9 m) long and 41 ft wide.

Location

Open in Google Maps
CarriesN-W Ramp
CrossesI-5
Location0.3 N Oregon
RouteInterstate 5
CountyClark County
StateWashington
Coordinates45.62333, -122.67054
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 inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating85 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length390 ft (118.9 m)
Longest span158 ft (48.2 m)
Deck width41 ft (12.5 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,513 (2023)
Projected traffic13,459 by 2039
Trucks15%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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$7.4 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

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

It was built in 1983, making it 42 years old in 2025.

What condition is N-W 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 October 2023.

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

About 7,513 vehicles per day (2023 count), of which roughly 15% are trucks.

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

The structure is 390 ft (118.9 m) long with a longest span of 158 ft (48.2 m) and a deck 41 ft wide.

Who owns N-W Ramp over I-5?

It is owned by the State Highway Agency.