US Bridges

SR 11 over Half Br

Fair

Skagit County, Washington · 12.8 N JCT I-5 · Structure no. 0003732A0000000

Built
1950
75 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Concrete Continuous
Length
67 ft
3 main spans
Daily traffic
2,472
2023 count
Owner
State
State Highway Agency

About this bridge

SR 11 over Half Br is a concrete continuous stringer/multi-beam or girder carrying SR 11 over Half Br in Skagit County, Washington. It was built in 1950, so it is 75 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 2,472 vehicles a day, roughly 4% of them trucks, projected to reach 3,569 by 2039. The structure is 67 ft (20.4 m) long and 10 ft wide. If it were closed, the detour would be 29.2 mi (47 km).

Location

Open in Google Maps
CarriesSR 11
CrossesHalf Br
Location12.8 N JCT I-5
RouteState Highway 11
CountySkagit County
StateWashington
Coordinates48.63011, -122.46797
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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment6: Equal to present minimum criteria
Operating rating31.7 US tons
Inventory rating24.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length67 ft (20.4 m)
Longest span26 ft (7.9 m)
Deck width10 ft (3 m)
Roadway width19 ft (5.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,472 (2023)
Projected traffic3,569 by 2039
Trucks4%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesOther
Detour if closed29.2 mi (47 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$668,000 (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 11 over Half Br built?

It was built in 1950, making it 75 years old in 2025.

What condition is SR 11 over Half Br 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 September 2024.

How much traffic does SR 11 over Half Br carry?

About 2,472 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is SR 11 over Half Br?

The structure is 67 ft (20.4 m) long with a longest span of 26 ft (7.9 m) and a deck 10 ft wide.

Who owns SR 11 over Half Br?

It is owned by the State Highway Agency.