US Bridges

Young St/Sayles ST over Dunton ST Viaduct

FairPosted for load

Ketchikan Gateway Borough, Alaska · Mile Point 0.1 · Structure no. 0453

Built
1979
46 years old
Condition
Fair
inspected June 2023
Type
Slab
Prestressed Concrete
Length
540 ft
28 main spans
Daily traffic
565
2018 count
Owner
City
City or Municipal Highway Agency

About this bridge

Young St/Sayles ST over Dunton ST Viaduct is a prestressed concrete slab carrying Young St/Sayles ST over Dunton ST Viaduct in Ketchikan Gateway Borough, Alaska. It was built in 1979, so it is 46 years old, older than the Alaska average of 35.9 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 565 vehicles a day, roughly 5% of them trucks, projected to reach 750 by 2035. The structure is 540 ft (164.6 m) long and 14 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesYoung St/Sayles ST
CrossesDunton ST Viaduct
LocationMile Point 0.1
RouteState Highway 919
CountyKetchikan Gateway Borough
StateAlaska
Coordinates55.34583, -131.65611
Functional classUrban Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating16.9 US tons
Inventory rating3.4 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans28
Design loadH 20
Structure length540 ft (164.6 m)
Longest span20 ft (6.1 m)
Deck width14 ft (4.3 m)
Roadway width13 ft (4.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic565 (2018)
Projected traffic750 by 2035
Trucks5%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway and pedestrian
CrossesOther
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Young St/Sayles ST over Dunton ST Viaduct built?

It was built in 1979, making it 46 years old in 2025.

What condition is Young St/Sayles ST over Dunton ST Viaduct 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 June 2023.

How much traffic does Young St/Sayles ST over Dunton ST Viaduct carry?

About 565 vehicles per day (2018 count), of which roughly 5% are trucks.

How long is Young St/Sayles ST over Dunton ST Viaduct?

The structure is 540 ft (164.6 m) long with a longest span of 20 ft (6.1 m) and a deck 14 ft wide.

Who owns Young St/Sayles ST over Dunton ST Viaduct?

It is owned by the City or Municipal Highway Agency.