US Bridges

Irr:airfield Road over Round Top Valley Creek

Fair

Aleutians East Borough, Alaska · False Pass · Structure no. 1536

Built
1989
36 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
120 ft
3 main spans
Daily traffic
82
2018 count
Owner
City
City or Municipal Highway Agency

About this bridge

Irr:airfield Road over Round Top Valley Creek is a wood or timber stringer/multi-beam or girder carrying Irr:airfield Road over Round Top Valley Creek in Aleutians East Borough, Alaska. It was built in 1989, so it is 36 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 82 vehicles a day, roughly 10% of them trucks, projected to reach 120 by 2035. The structure is 120 ft (36.6 m) long and 15 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesIrr:airfield Road
CrossesRound Top Valley Creek
LocationFalse Pass
StateAlaska
Coordinates54.8513, -163.41224
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 rating51 US tons
Inventory rating35.3 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadHS 20
Structure length120 ft (36.6 m)
Longest span40 ft (12.1 m)
Deck width15 ft (4.6 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic82 (2018)
Projected traffic120 by 2035
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal 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 Irr:airfield Road over Round Top Valley Creek built?

It was built in 1989, making it 36 years old in 2025.

What condition is Irr:airfield Road over Round Top Valley Creek 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:airfield Road over Round Top Valley Creek carry?

About 82 vehicles per day (2018 count), of which roughly 10% are trucks.

How long is Irr:airfield Road over Round Top Valley Creek?

The structure is 120 ft (36.6 m) long with a longest span of 40 ft (12.1 m) and a deck 15 ft wide.

Who owns Irr:airfield Road over Round Top Valley Creek?

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