US Bridges

SR 9 over Lake Creek

Fair

Skagit County, Washington · 3.7 N JCT SR 534 · Structure no. 0004328A0000000

Built
1952
73 years old
Condition
Fair
inspected August 2024
Type
Slab
Concrete Continuous
Length
68 ft
4 main spans
Daily traffic
1,651
2023 count
Owner
State
State Highway Agency

About this bridge

SR 9 over Lake Creek is a concrete continuous slab carrying SR 9 over Lake Creek in Skagit County, Washington. It was built in 1952, so it is 73 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 1,651 vehicles a day, roughly 7% of them trucks, projected to reach 2,400 by 2039. The structure is 68 ft (20.7 m) long and 40 ft wide. If it were closed, the detour would be 24.9 mi (40 km).

Location

Open in Google Maps
CarriesSR 9
CrossesLake Creek
Location3.7 N JCT SR 534
RouteState Highway 9
CountySkagit County
StateWashington
Coordinates48.35575, -122.20353
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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 15
Structure length68 ft (20.7 m)
Longest span18 ft (5.5 m)
Deck width40 ft (12.3 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,651 (2023)
Projected traffic2,400 by 2039
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.9 mi (40 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$904,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 9 over Lake Creek built?

It was built in 1952, making it 73 years old in 2025.

What condition is SR 9 over Lake Creek 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 August 2024.

How much traffic does SR 9 over Lake Creek carry?

About 1,651 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is SR 9 over Lake Creek?

The structure is 68 ft (20.7 m) long with a longest span of 18 ft (5.5 m) and a deck 40 ft wide.

Who owns SR 9 over Lake Creek?

It is owned by the State Highway Agency.