US Bridges

I-5 over 300th ST Nw/Freeborn RD

Fair

Snohomish County, Washington · 2.4 N JCT SR 532 · Structure no. 0008879B0000000

Built
1971
54 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
150 ft
3 main spans
Daily traffic
33,190
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 over 300th ST Nw/Freeborn RD is a prestressed concrete continuous stringer/multi-beam or girder carrying I-5 over 300th ST Nw/Freeborn RD in Snohomish County, Washington. It was built in 1971, so it is 54 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 33,190 vehicles a day, roughly 10% of them trucks, projected to reach 47,423 by 2039. The structure is 150 ft (45.7 m) long and 55 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-5
Crosses300th ST Nw/Freeborn RD
Location2.4 N JCT SR 532
RouteInterstate 5
CountySnohomish County
StateWashington
Coordinates48.26736, -122.26925
Functional classRural 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to 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 rating60 US tons
Inventory rating34.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length150 ft (45.7 m)
Longest span61 ft (18.6 m)
Deck width55 ft (16.8 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic33,190 (2023)
Projected traffic47,423 by 2039
Trucks10%
Lanes on structure3
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$3.8 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 over 300th ST Nw/Freeborn RD built?

It was built in 1971, making it 54 years old in 2025.

What condition is I-5 over 300th ST Nw/Freeborn RD 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 June 2023.

How much traffic does I-5 over 300th ST Nw/Freeborn RD carry?

About 33,190 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is I-5 over 300th ST Nw/Freeborn RD?

The structure is 150 ft (45.7 m) long with a longest span of 61 ft (18.6 m) and a deck 55 ft wide.

Who owns I-5 over 300th ST Nw/Freeborn RD?

It is owned by the State Highway Agency.