US Bridges

Irr:airport Road over Mukluk Creek

Fair

Yukon-Koyukuk Census Area, Alaska · Mile Point 0.8 · Structure no. 1382

Built
1956
69 years old, rebuilt 2021
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
65 ft
1 main span
Daily traffic
10
2018 count
Owner
State
State Highway Agency

About this bridge

Irr:airport Road over Mukluk Creek is a steel stringer/multi-beam or girder carrying Irr:airport Road over Mukluk Creek in Yukon-Koyukuk Census Area, Alaska. It was built in 1956 and reconstructed in 2021, so it is 69 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 10 vehicles a day, roughly 6% of them trucks, projected to reach 40 by 2035. The structure is 65 ft (19.8 m) long and 20 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesIrr:airport Road
CrossesMukluk Creek
LocationMile Point 0.8
CountyYukon-Koyukuk Census Area
StateAlaska
Coordinates64.72187, -158.09996
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 inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
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 alignment8: Equal to present desirable criteria
Operating rating66.1 US tons
Inventory rating36.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadHL 93
Structure length65 ft (19.8 m)
Longest span63 ft (19.2 m)
Deck width20 ft (6.1 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2018)
Projected traffic40 by 2035
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 Irr:airport Road over Mukluk Creek built?

It was built in 1956, making it 69 years old in 2025. It was reconstructed in 2021.

What condition is Irr:airport Road over Mukluk 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 July 2024.

How much traffic does Irr:airport Road over Mukluk Creek carry?

About 10 vehicles per day (2018 count), of which roughly 6% are trucks.

How long is Irr:airport Road over Mukluk Creek?

The structure is 65 ft (19.8 m) long with a longest span of 63 ft (19.2 m) and a deck 20 ft wide.

Who owns Irr:airport Road over Mukluk Creek?

It is owned by the State Highway Agency.