US Bridges

Irr:steward Road over Unalaska Creek

Good

Aleutians West Census Area, Alaska · Mile Point 0.6 · Structure no. 1531

Built
2006
19 years old
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
80 ft
1 main span
Daily traffic
2,333
2018 count
Owner
City
City or Municipal Highway Agency

About this bridge

Irr:steward Road over Unalaska Creek is a steel stringer/multi-beam or girder carrying Irr:steward Road over Unalaska Creek in Aleutians West Census Area, Alaska. It was built in 2006, so it is 19 years old, younger than the Alaska average of 35.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,333 vehicles a day, roughly 11% of them trucks, projected to reach 2,500 by 2035. The structure is 80 ft (24.4 m) long and 34 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesIrr:steward Road
CrossesUnalaska Creek
LocationMile Point 0.6
StateAlaska
Coordinates53.86094, -166.51218
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.7 US tons
Inventory rating49.7 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length80 ft (24.4 m)
Longest span78 ft (23.8 m)
Deck width34 ft (10.4 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,333 (2018)
Projected traffic2,500 by 2035
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
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 Irr:steward Road over Unalaska Creek built?

It was built in 2006, making it 19 years old in 2025.

What condition is Irr:steward Road over Unalaska Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2024.

How much traffic does Irr:steward Road over Unalaska Creek carry?

About 2,333 vehicles per day (2018 count), of which roughly 11% are trucks.

How long is Irr:steward Road over Unalaska Creek?

The structure is 80 ft (24.4 m) long with a longest span of 78 ft (23.8 m) and a deck 34 ft wide.

Who owns Irr:steward Road over Unalaska Creek?

It is owned by the City or Municipal Highway Agency.