US Bridges

SR 11 over Cliff

Good

Skagit County, Washington · 11.9 N JCT I-5 · Structure no. 0015597B0000000

Built
1999
26 years old
Condition
Good
inspected August 2022
Type
Slab
Concrete Continuous
Length
138 ft
3 main spans
Daily traffic
2,472
2023 count
Owner
State
State Highway Agency

About this bridge

SR 11 over Cliff is a concrete continuous slab carrying SR 11 over Cliff in Skagit County, Washington. It was built in 1999, so it is 26 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,472 vehicles a day, roughly 4% of them trucks, projected to reach 3,569 by 2039. The structure is 138 ft (42.1 m) long and 11 ft wide. If it were closed, the detour would be 29.2 mi (47 km).

Location

Open in Google Maps
CarriesSR 11
CrossesCliff
Location11.9 N JCT I-5
RouteState Highway 11
CountySkagit County
StateWashington
Coordinates48.62407, -122.45195
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating99 US tons
Inventory rating72 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length138 ft (42.1 m)
Longest span49 ft (14.9 m)
Deck width11 ft (3.5 m)
Roadway width20 ft (6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,472 (2023)
Projected traffic3,569 by 2039
Trucks4%
Lanes on structure2
Traffic directionTwo-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 statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.4 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 11 over Cliff built?

It was built in 1999, making it 26 years old in 2025.

What condition is SR 11 over Cliff in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2022.

How much traffic does SR 11 over Cliff carry?

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

How long is SR 11 over Cliff?

The structure is 138 ft (42.1 m) long with a longest span of 49 ft (14.9 m) and a deck 11 ft wide.

Who owns SR 11 over Cliff?

It is owned by the State Highway Agency.