US Bridges

Cook RD over I-5

Fair

Skagit County, Washington · 1.6 N JCT SR 11 · Structure no. 0007127A0000000

Built
1963
62 years old
Condition
Fair
inspected March 2024
Type
Slab
Concrete Continuous
Length
126 ft
2 main spans
Daily traffic
10,683
2012 count
Owner
State
State Highway Agency

About this bridge

Cook RD over I-5 is a concrete continuous slab carrying Cook RD over I-5 in Skagit County, Washington. It was built in 1963, so it is 62 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 10,683 vehicles a day, roughly 1% of them trucks, projected to reach 17,093 by 2036. The structure is 126 ft (38.5 m) long and 36 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesCook RD
CrossesI-5
Location1.6 N JCT SR 11
RouteCounty Highway 0
Coordinates48.50775, -122.33961
Functional classRural Major Collector

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 inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55 US tons
Inventory rating42.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length126 ft (38.5 m)
Longest span60 ft (18.4 m)
Deck width36 ft (10.9 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,683 (2012)
Projected traffic17,093 by 2036
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

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$2.5 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Cook RD over I-5 built?

It was built in 1963, making it 62 years old in 2025.

What condition is Cook 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 2024.

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

About 10,683 vehicles per day (2012 count), of which roughly 1% are trucks.

How long is Cook RD over I-5?

The structure is 126 ft (38.5 m) long with a longest span of 60 ft (18.4 m) and a deck 36 ft wide.

Who owns Cook RD over I-5?

It is owned by the State Highway Agency.