US Bridges

SR 11 over Joe Leary Slough

Fair

Skagit County, Washington · 0.7 N JCT I-5 · Structure no. 0000584A0000000

Built
1922
103 years old
Condition
Fair
inspected March 2024
Type
Slab
Concrete
Length
32 ft
1 main span
Daily traffic
4,929
2023 count
Owner
State
State Highway Agency

About this bridge

SR 11 over Joe Leary Slough is a concrete slab carrying SR 11 over Joe Leary Slough in Skagit County, Washington. It was built in 1922, so it is 103 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 5 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 4,929 vehicles a day, roughly 6% of them trucks, projected to reach 7,226 by 2039. The structure is 32 ft (9.8 m) long and 27 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSR 11
CrossesJoe Leary Slough
Location0.7 N JCT I-5
RouteState Highway 11
CountySkagit County
StateWashington
Coordinates48.49328, -122.34694
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating27.9 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length32 ft (9.8 m)
Longest span30 ft (9.1 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,929 (2023)
Projected traffic7,226 by 2039
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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$517,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 11 over Joe Leary Slough built?

It was built in 1922, making it 103 years old in 2025.

What condition is SR 11 over Joe Leary Slough 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 SR 11 over Joe Leary Slough carry?

About 4,929 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is SR 11 over Joe Leary Slough?

The structure is 32 ft (9.8 m) long with a longest span of 30 ft (9.1 m) and a deck 27 ft wide.

Who owns SR 11 over Joe Leary Slough?

It is owned by the State Highway Agency.