US Bridges

Anderson RD over I-5

Fair

Skagit County, Washington · 4.0 N JCT SR 534 · Structure no. 0009563A0000000

Built
1974
51 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
208 ft
2 main spans
Daily traffic
6,325
2021 count
Owner
State
State Highway Agency

About this bridge

Anderson RD over I-5 is a prestressed concrete continuous stringer/multi-beam or girder carrying Anderson RD over I-5 in Skagit County, Washington. It was built in 1974, so it is 51 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 6,325 vehicles a day, roughly 1% of them trucks, projected to reach 10,566 by 2040. The structure is 208 ft (63.4 m) long and 43 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesAnderson RD
CrossesI-5
Location4.0 N JCT SR 534
RouteCounty Highway 0
CountySkagit County
StateWashington
Coordinates48.39943, -122.33092
Functional classUrban Other Principal 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 inspectionMarch 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 rating56 US tons
Inventory rating33 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length208 ft (63.4 m)
Longest span101 ft (30.8 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,325 (2021)
Projected traffic10,566 by 2040
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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$4.2 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Anderson RD over I-5 built?

It was built in 1974, making it 51 years old in 2025.

What condition is Anderson RD 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 March 2023.

How much traffic does Anderson RD over I-5 carry?

About 6,325 vehicles per day (2021 count), of which roughly 1% are trucks.

How long is Anderson RD over I-5?

The structure is 208 ft (63.4 m) long with a longest span of 101 ft (30.8 m) and a deck 43 ft wide.

Who owns Anderson RD over I-5?

It is owned by the State Highway Agency.