US Bridges

4th Plain Blvd over I-5

Fair

Clark County, Washington · 1.2 N JCT SR 14 · Structure no. 0011978A0000000

Built
1982
43 years old
Condition
Fair
inspected September 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
253 ft
2 main spans
Daily traffic
18,579
2012 count
Owner
State
State Highway Agency

About this bridge

4th Plain Blvd over I-5 is a prestressed concrete continuous box beam or girders - multiple carrying 4th Plain Blvd over I-5 in Clark County, Washington. It was built in 1982, so it is 43 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 18,579 vehicles a day, roughly 9% of them trucks, projected to reach 30,618 by 2036. The structure is 253 ft (77.1 m) long and 71 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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Carries4th Plain Blvd
CrossesI-5
Location1.2 N JCT SR 14
RouteCity Street 0
CountyClark County
StateWashington
Coordinates45.63869, -122.66253
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating84 US tons
Inventory rating48.9 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length253 ft (77.1 m)
Longest span137 ft (41.8 m)
Deck width71 ft (21.7 m)
Roadway width63 ft (19.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,579 (2012)
Projected traffic30,618 by 2036
Trucks9%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 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$7.8 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was 4th Plain Blvd over I-5 built?

It was built in 1982, making it 43 years old in 2025.

What condition is 4th Plain Blvd over I-5 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 September 2023.

How much traffic does 4th Plain Blvd over I-5 carry?

About 18,579 vehicles per day (2012 count), of which roughly 9% are trucks.

How long is 4th Plain Blvd over I-5?

The structure is 253 ft (77.1 m) long with a longest span of 137 ft (41.8 m) and a deck 71 ft wide.

Who owns 4th Plain Blvd over I-5?

It is owned by the State Highway Agency.