US Bridges

Anton Larsen Bay over Red Cloud River

Fair

Kodiak Island Borough, Alaska · Mile Point 7.5 · Structure no. 0983

Built
1974
51 years old
Condition
Fair
inspected September 2024
Type
Tee Beam
Prestressed Concrete
Length
63 ft
2 main spans
Daily traffic
90
2020 count
Owner
State
State Highway Agency

About this bridge

Anton Larsen Bay over Red Cloud River is a prestressed concrete tee beam carrying Anton Larsen Bay over Red Cloud River in Kodiak Island Borough, Alaska. It was built in 1974, so it is 51 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 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 90 vehicles a day, roughly 6% of them trucks, projected to reach 140 by 2039. The structure is 63 ft (19.2 m) long and 28 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesAnton Larsen Bay
CrossesRed Cloud River
LocationMile Point 7.5
RouteState Highway 391
StateAlaska
Coordinates57.81659, -152.62564
Functional classRural Minor 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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating71.8 US tons
Inventory rating42.8 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans2
Design loadHS 20
Structure length63 ft (19.2 m)
Longest span31 ft (9.4 m)
Deck width28 ft (8.5 m)
Roadway width23 ft (7.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic90 (2020)
Projected traffic140 by 2039
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free 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 Anton Larsen Bay over Red Cloud River built?

It was built in 1974, making it 51 years old in 2025.

What condition is Anton Larsen Bay over Red Cloud River 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 Anton Larsen Bay over Red Cloud River carry?

About 90 vehicles per day (2020 count), of which roughly 6% are trucks.

How long is Anton Larsen Bay over Red Cloud River?

The structure is 63 ft (19.2 m) long with a longest span of 31 ft (9.4 m) and a deck 28 ft wide.

Who owns Anton Larsen Bay over Red Cloud River?

It is owned by the State Highway Agency.