US Bridges

Nabesna Road over Slana River

FairPosted for load

County 066, Alaska · Mile Point 1.5 · Structure no. 0858

Built
1968
57 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
250 ft
3 main spans
Daily traffic
130
2020 count
Owner
State
State Highway Agency

About this bridge

Nabesna Road over Slana River is a steel continuous stringer/multi-beam or girder carrying Nabesna Road over Slana River in County 066, Alaska. It was built in 1968, so it is 57 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 130 vehicles a day, roughly 15% of them trucks, projected to reach 170 by 2039. The structure is 250 ft (76.2 m) long and 30 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesNabesna Road
CrossesSlana River
LocationMile Point 1.5
RouteState Highway 880
StateAlaska
Coordinates62.7048, -143.9468
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 protection7 GoodSome minor problems.
Last inspectionJuly 2023
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.8 US tons
Inventory rating23.9 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length250 ft (76.2 m)
Longest span94 ft (28.7 m)
Deck width30 ft (9 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic130 (2020)
Projected traffic170 by 2039
Trucks15%
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 Nabesna Road over Slana River built?

It was built in 1968, making it 57 years old in 2025.

What condition is Nabesna Road over Slana 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 July 2023.

How much traffic does Nabesna Road over Slana River carry?

About 130 vehicles per day (2020 count), of which roughly 15% are trucks.

How long is Nabesna Road over Slana River?

The structure is 250 ft (76.2 m) long with a longest span of 94 ft (28.7 m) and a deck 30 ft wide.

Who owns Nabesna Road over Slana River?

It is owned by the State Highway Agency.