US Bridges

Nabesna Road over Jack Creek

Fair

County 066, Alaska · Mile Point 35.2 · Structure no. 0861

Built
1969
56 years old, rebuilt 2015
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
121 ft
4 main spans
Daily traffic
80
2020 count
Owner
State
State Highway Agency

About this bridge

Nabesna Road over Jack Creek is a steel continuous stringer/multi-beam or girder carrying Nabesna Road over Jack Creek in County 066, Alaska. It was built in 1969 and reconstructed in 2015, so it is 56 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 5 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 80 vehicles a day, roughly 10% of them trucks, projected to reach 270 by 2039. The structure is 121 ft (36.8 m) long and 16 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesNabesna Road
CrossesJack Creek
LocationMile Point 35.2
RouteState Highway 880
CountyCounty 066
StateAlaska
Coordinates62.4631, -143.1027
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating73.3 US tons
Inventory rating55.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckWood or timber
Main spans4
Design loadHS 20
Structure length121 ft (36.8 m)
Longest span28 ft (8.5 m)
Deck width16 ft (4.9 m)
Roadway width13 ft (4.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic80 (2020)
Projected traffic270 by 2039
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

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 Nabesna Road over Jack Creek built?

It was built in 1969, making it 56 years old in 2025. It was reconstructed in 2015.

What condition is Nabesna Road over Jack 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 2023.

How much traffic does Nabesna Road over Jack Creek carry?

About 80 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Nabesna Road over Jack Creek?

The structure is 121 ft (36.8 m) long with a longest span of 28 ft (8.5 m) and a deck 16 ft wide.

Who owns Nabesna Road over Jack Creek?

It is owned by the State Highway Agency.