US Bridges

Ferry Traffic over Blind Bay

FairPosted for load

San Juan County, Washington · Blind Bay-San Juan · Structure no. 000000QG0000000

Built
1973
52 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
83 ft
7 main spans
Daily traffic
308
2010 count
Owner
State
State Highway Agency

About this bridge

Ferry Traffic over Blind Bay is a wood or timber stringer/multi-beam or girder carrying Ferry Traffic over Blind Bay in San Juan County, Washington. It was built in 1973, so it is 52 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. Its operating status is: posted for load restriction.

It carries about 308 vehicles a day, roughly 1% of them trucks, projected to reach 532 by 2036. The structure is 83 ft (25.3 m) long and 11 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesFerry Traffic
CrossesBlind Bay
LocationBlind Bay-San Juan
RouteState Highway 20
Coordinates48.58429, -122.92979
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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
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 rating22 US tons
Inventory rating16 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans7
Design loadHS 15
Structure length83 ft (25.3 m)
Longest span10 ft (3 m)
Deck width11 ft (3.4 m)
Roadway width10 ft (3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic308 (2010)
Projected traffic532 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$670,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Ferry Traffic over Blind Bay built?

It was built in 1973, making it 52 years old in 2025.

What condition is Ferry Traffic over Blind Bay 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 Ferry Traffic over Blind Bay carry?

About 308 vehicles per day (2010 count), of which roughly 1% are trucks.

How long is Ferry Traffic over Blind Bay?

The structure is 83 ft (25.3 m) long with a longest span of 10 ft (3 m) and a deck 11 ft wide.

Who owns Ferry Traffic over Blind Bay?

It is owned by the State Highway Agency.