US Bridges

I-182 over N 20th Ave

Fair

Franklin County, Washington · 6.8 E Benton CO · Structure no. 0008422B0000000

Built
1968
57 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
161 ft
3 main spans
Daily traffic
19,854
2023 count
Owner
State
State Highway Agency

About this bridge

I-182 over N 20th Ave is a prestressed concrete continuous stringer/multi-beam or girder carrying I-182 over N 20th Ave in Franklin County, Washington. It was built in 1968, so it is 57 years old, older 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 19,854 vehicles a day, roughly 6% of them trucks, projected to reach 23,607 by 2039. The structure is 161 ft (49.1 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-182
CrossesN 20th Ave
Location6.8 E Benton CO
RouteInterstate 182
CountyFranklin County
StateWashington
Coordinates46.24881, -119.11736
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87 US tons
Inventory rating51 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length161 ft (49.1 m)
Longest span77 ft (23.5 m)
Deck width41 ft (12.6 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,854 (2023)
Projected traffic23,607 by 2039
Trucks6%
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 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$3.1 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-182 over N 20th Ave built?

It was built in 1968, making it 57 years old in 2025.

What condition is I-182 over N 20th Ave 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 March 2023.

How much traffic does I-182 over N 20th Ave carry?

About 19,854 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is I-182 over N 20th Ave?

The structure is 161 ft (49.1 m) long with a longest span of 77 ft (23.5 m) and a deck 41 ft wide.

Who owns I-182 over N 20th Ave?

It is owned by the State Highway Agency.