US Bridges

IRR:5th Street over Iliuliuk River

FairPosted for load

Aleutians West Census Area, Alaska · Mile Point 0.1 · Structure no. 1407

Built
1983
42 years old
Condition
Fair
inspected September 2024
Type
Tee Beam
Prestressed Concrete
Length
100 ft
1 main span
Daily traffic
2,750
2020 count
Owner
State
State Highway Agency

About this bridge

IRR:5th Street over Iliuliuk River is a prestressed concrete tee beam carrying IRR:5th Street over Iliuliuk River in Aleutians West Census Area, Alaska. It was built in 1983, so it is 42 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. Its operating status is: posted for load restriction.

It carries about 2,750 vehicles a day, roughly 4% of them trucks, projected to reach 3,460 by 2039. The structure is 100 ft (30.5 m) long and 41 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesIRR:5th Street
CrossesIliuliuk River
LocationMile Point 0.1
RouteState Highway 310
StateAlaska
Coordinates53.87209, -166.53261
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 protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating41.4 US tons
Inventory rating24.9 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length100 ft (30.5 m)
Longest span97 ft (29.7 m)
Deck width41 ft (12.5 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,750 (2020)
Projected traffic3,460 by 2039
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState 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 IRR:5th Street over Iliuliuk River built?

It was built in 1983, making it 42 years old in 2025.

What condition is IRR:5th Street over Iliuliuk 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 IRR:5th Street over Iliuliuk River carry?

About 2,750 vehicles per day (2020 count), of which roughly 4% are trucks.

How long is IRR:5th Street over Iliuliuk River?

The structure is 100 ft (30.5 m) long with a longest span of 97 ft (29.7 m) and a deck 41 ft wide.

Who owns IRR:5th Street over Iliuliuk River?

It is owned by the State Highway Agency and maintained by the City or Municipal Highway Agency.