US Bridges

Irr:northway Road over Chisana River

Fair

Southeast Fairbanks Census Area, Alaska · Mile Point 0.3 · Structure no. 0424

Built
1944
81 years old
Condition
Fair
inspected July 2024
Type
Truss - Thru
Steel
Length
252 ft
1 main span
Daily traffic
210
2020 count
Owner
State
State Highway Agency

About this bridge

Irr:northway Road over Chisana River is a steel truss - thru carrying Irr:northway Road over Chisana River in Southeast Fairbanks Census Area, Alaska. It was built in 1944, so it is 81 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 210 vehicles a day, roughly 6% of them trucks, projected to reach 290 by 2039. The structure is 252 ft (76.8 m) long and 27 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesIrr:northway Road
CrossesChisana River
LocationMile Point 0.3
RouteState Highway 791
CountySoutheast Fairbanks Census Area
StateAlaska
Coordinates63.00648, -141.80699
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating69 US tons
Inventory rating29.7 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length252 ft (76.8 m)
Longest span250 ft (76.2 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deck16 ft (4.9 m)

Traffic and service

Average daily traffic210 (2020)
Projected traffic290 by 2039
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:northway Road over Chisana River built?

It was built in 1944, making it 81 years old in 2025.

What condition is Irr:northway Road over Chisana 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 2024.

How much traffic does Irr:northway Road over Chisana River carry?

About 210 vehicles per day (2020 count), of which roughly 6% are trucks.

How long is Irr:northway Road over Chisana River?

The structure is 252 ft (76.8 m) long with a longest span of 250 ft (76.2 m) and a deck 27 ft wide.

Who owns Irr:northway Road over Chisana River?

It is owned by the State Highway Agency.