US Bridges

NE 129th ST over I-5

Good

Clark County, Washington · 4.7 N JCT SR 500 · Structure no. 0016610C0000000

Built
2004
21 years old
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
174 ft
2 main spans
Daily traffic
3,655
2021 count
Owner
State
State Highway Agency

About this bridge

NE 129th ST over I-5 is a prestressed concrete continuous stringer/multi-beam or girder carrying NE 129th ST over I-5 in Clark County, Washington. It was built in 2004, so it is 21 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 3,655 vehicles a day, roughly 5% of them trucks, projected to reach 5,873 by 2041. The structure is 174 ft (53 m) long and 55 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesNE 129th ST
CrossesI-5
Location4.7 N JCT SR 500
RouteCounty Highway 0
Coordinates45.71464, -122.65379
Functional classUrban Collector

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 inspectionMay 2024
Inspection intervalevery 48 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 rating90.9 US tons
Inventory rating55 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length174 ft (53 m)
Longest span95 ft (28.9 m)
Deck width55 ft (16.7 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,655 (2021)
Projected traffic5,873 by 2041
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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$3.5 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was NE 129th ST over I-5 built?

It was built in 2004, making it 21 years old in 2025.

What condition is NE 129th ST 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 May 2024.

How much traffic does NE 129th ST over I-5 carry?

About 3,655 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is NE 129th ST over I-5?

The structure is 174 ft (53 m) long with a longest span of 95 ft (28.9 m) and a deck 55 ft wide.

Who owns NE 129th ST over I-5?

It is owned by the State Highway Agency.