US Bridges

I-5 NB over Fisher Creek

Good

Skagit County, Washington · 1.8 N Snohomish CO · Structure no. 0018840A0000000

Built
2016
9 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Concrete
Length
110 ft
1 main span
Daily traffic
33,686
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 NB over Fisher Creek is a concrete stringer/multi-beam or girder carrying I-5 NB over Fisher Creek in Skagit County, Washington. It was built in 2016, so it is 9 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 33,686 vehicles a day, roughly 10% of them trucks, projected to reach 48,545 by 2039. The structure is 110 ft (33.5 m) long and 54 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesI-5 NB
CrossesFisher Creek
Location1.8 N Snohomish CO
RouteInterstate 5
CountySkagit County
StateWashington
Coordinates48.31894, -122.32586
Functional classRural Principal Arterial - Interstate

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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.5 US tons
Inventory rating40.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length110 ft (33.5 m)
Longest span105 ft (32 m)
Deck width54 ft (16.5 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic33,686 (2023)
Projected traffic48,545 by 2039
Trucks10%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2.8 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 NB over Fisher Creek built?

It was built in 2016, making it 9 years old in 2025.

What condition is I-5 NB over Fisher Creek 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 July 2023.

How much traffic does I-5 NB over Fisher Creek carry?

About 33,686 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is I-5 NB over Fisher Creek?

The structure is 110 ft (33.5 m) long with a longest span of 105 ft (32 m) and a deck 54 ft wide.

Who owns I-5 NB over Fisher Creek?

It is owned by the State Highway Agency.