US Bridges

I-5 over NE 179th ST

Fair

Clark County, Washington · 2.0 N JCT I-205 · Structure no. 0008055A0000000

Built
1966
59 years old
Condition
Fair
inspected November 2023
Type
Slab
Concrete Continuous
Length
124 ft
3 main spans
Daily traffic
56,125
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 over NE 179th ST is a concrete continuous slab carrying I-5 over NE 179th ST in Clark County, Washington. It was built in 1966, so it is 59 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 56,125 vehicles a day, roughly 15% of them trucks, projected to reach 79,525 by 2039. The structure is 124 ft (37.8 m) long and 55 ft wide.

CarriesI-5
CrossesNE 179th ST
Location2.0 N JCT I-205
RouteInterstate 5
Coordinates45.75048, -122.66284
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.7 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length124 ft (37.8 m)
Longest span49 ft (14.9 m)
Deck width55 ft (16.8 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic56,125 (2023)
Projected traffic79,525 by 2039
Trucks15%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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$3.4 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 over NE 179th ST built?

It was built in 1966, making it 59 years old in 2025.

What condition is I-5 over NE 179th ST 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 November 2023.

How much traffic does I-5 over NE 179th ST carry?

About 56,125 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is I-5 over NE 179th ST?

The structure is 124 ft (37.8 m) long with a longest span of 49 ft (14.9 m) and a deck 55 ft wide.

Who owns I-5 over NE 179th ST?

It is owned by the State Highway Agency.