US Bridges

Inter Island RTE over Ketchikan Berth III

Fair

Ketchikan Gateway Borough, Alaska · Ketchikan · Structure no. 0190

Built
2003
22 years old
Condition
Fair
inspected May 2023
Type
Box Beam or Girders - Multiple
Steel
Length
143 ft
1 main span
Daily traffic
50
2018 count
Owner
State
State Highway Agency

About this bridge

Inter Island RTE over Ketchikan Berth III is a steel box beam or girders - multiple carrying Inter Island RTE over Ketchikan Berth III in Ketchikan Gateway Borough, Alaska. It was built in 2003, so it is 22 years old, younger 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 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 50 vehicles a day, roughly 1% of them trucks, projected to reach 60 by 2035. The structure is 143 ft (43.6 m) long and 20 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesInter Island RTE
CrossesKetchikan Berth III
LocationKetchikan
RouteState Highway 0
CountyKetchikan Gateway Borough
StateAlaska
Coordinates55.35405, -131.6919
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.4 US tons
Inventory rating36 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialSteel
DeckOpen grating
Main spans1
Design loadHS 20 + Mod
Structure length143 ft (43.6 m)
Longest span140 ft (42.7 m)
Deck width20 ft (6.1 m)
Roadway width13 ft (4.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2018)
Projected traffic60 by 2035
Trucks1%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a toll 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Inter Island RTE over Ketchikan Berth III built?

It was built in 2003, making it 22 years old in 2025.

What condition is Inter Island RTE over Ketchikan Berth III 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 May 2023.

How much traffic does Inter Island RTE over Ketchikan Berth III carry?

About 50 vehicles per day (2018 count), of which roughly 1% are trucks.

How long is Inter Island RTE over Ketchikan Berth III?

The structure is 143 ft (43.6 m) long with a longest span of 140 ft (42.7 m) and a deck 20 ft wide.

Who owns Inter Island RTE over Ketchikan Berth III?

It is owned by the State Highway Agency.