US Bridges

Extension of SR 20 over Upright Channel

Fair

San Juan County, Washington · N End Lopez Island · Structure no. 0012015A0000000

Built
1981
44 years old
Condition
Fair
inspected September 2024
Type
Movable - Lift
Steel
Length
105 ft
1 main span
Daily traffic
1,349
2010 count
Owner
State
State Highway Agency

About this bridge

Extension of SR 20 over Upright Channel is a steel movable - lift carrying Extension of SR 20 over Upright Channel in San Juan County, Washington. It was built in 1981, so it is 44 years old, younger 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 1,349 vehicles a day, roughly 1% of them trucks, projected to reach 2,331 by 2036. The structure is 105 ft (32 m) long and 24 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesExtension of SR 20
CrossesUpright Channel
LocationN End Lopez Island
RouteState Highway 20
CountySan Juan County
StateWashington
Coordinates48.57064, -122.88336
Functional classUrban Other Principal Arterial

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be 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 rating30 US tons
Inventory rating18 US tons

Structure

Structure typeMovable - Lift
MaterialSteel
DeckClosed grating
Main spans1
Design loadHS 20
Structure length105 ft (32 m)
Longest span80 ft (24.4 m)
Deck width24 ft (7.3 m)
Roadway width15 ft (4.6 m)
Vertical clearance over deck16 ft (4.9 m)

Traffic and service

Average daily traffic1,349 (2010)
Projected traffic2,331 by 2036
Trucks1%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollToll bridge
National Highway SystemYes

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$948,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Extension of SR 20 over Upright Channel built?

It was built in 1981, making it 44 years old in 2025.

What condition is Extension of SR 20 over Upright Channel 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 Extension of SR 20 over Upright Channel carry?

About 1,349 vehicles per day (2010 count), of which roughly 1% are trucks.

How long is Extension of SR 20 over Upright Channel?

The structure is 105 ft (32 m) long with a longest span of 80 ft (24.4 m) and a deck 24 ft wide.

Who owns Extension of SR 20 over Upright Channel?

It is owned by the State Highway Agency.