US Bridges

Main Street over I-5 N-N Ramp

Good

Clark County, Washington · 0.8 N JCT SR 500 · Structure no. 0015661B0000000

Built
2001
24 years old
Condition
Good
inspected September 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
580 ft
4 main spans
Daily traffic
7,950
2012 count
Owner
State
State Highway Agency

About this bridge

Main Street over I-5 N-N Ramp is a prestressed concrete continuous box beam or girders - multiple carrying Main Street over I-5 N-N Ramp in Clark County, Washington. It was built in 2001, so it is 24 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 7,950 vehicles a day, roughly 5% of them trucks, projected to reach 13,102 by 2036. The structure is 580 ft (176.8 m) long and 39 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesMain Street
CrossesI-5 N-N Ramp
Location0.8 N JCT SR 500
RouteCity Street 0
Coordinates45.66064, -122.66547
Functional classUrban Other Principal Arterial

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 inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating76.9 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 25 or greater
Structure length580 ft (176.8 m)
Longest span184 ft (56.1 m)
Deck width39 ft (11.9 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,950 (2012)
Projected traffic13,102 by 2036
Trucks5%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes

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$11 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

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

It was built in 2001, making it 24 years old in 2025.

What condition is Main Street over I-5 N-N Ramp 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 September 2023.

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

About 7,950 vehicles per day (2012 count), of which roughly 5% are trucks.

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

The structure is 580 ft (176.8 m) long with a longest span of 184 ft (56.1 m) and a deck 39 ft wide.

Who owns Main Street over I-5 N-N Ramp?

It is owned by the State Highway Agency.