US Bridges

Maple Road over I-5

Fair

Snohomish County, Washington · 0.3 N JCT I-405 · Structure no. 0011598D0000000

Built
1962
63 years old, rebuilt 1980
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
478 ft
6 main spans
Daily traffic
8,340
2002 count
Owner
State
State Highway Agency

About this bridge

Maple Road over I-5 is a prestressed concrete stringer/multi-beam or girder carrying Maple Road over I-5 in Snohomish County, Washington. It was built in 1962 and reconstructed in 1980, so it is 63 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 8,340 vehicles a day, roughly 1% of them trucks, projected to reach 15,145 by 2036. The structure is 478 ft (145.7 m) long and 34 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesMaple Road
CrossesI-5
Location0.3 N JCT I-405
RouteCity Street 0
CountySnohomish County
StateWashington
Coordinates47.83464, -122.26231
Functional classUrban Minor 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 inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating84 US tons
Inventory rating48.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length478 ft (145.7 m)
Longest span107 ft (32.6 m)
Deck width34 ft (10.3 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,340 (2002)
Projected traffic15,145 by 2036
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.1 mi (5 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$7.5 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Maple Road over I-5 built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 1980.

What condition is Maple Road 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 October 2023.

How much traffic does Maple Road over I-5 carry?

About 8,340 vehicles per day (2002 count), of which roughly 1% are trucks.

How long is Maple Road over I-5?

The structure is 478 ft (145.7 m) long with a longest span of 107 ft (32.6 m) and a deck 34 ft wide.

Who owns Maple Road over I-5?

It is owned by the State Highway Agency.