US Bridges

Irr:nome-Council over Bonanza Channel

Fair

Nome Census Area, Alaska · Mile Point 31.6 · Structure no. 0347

Built
1977
48 years old
Condition
Fair
inspected August 2024
Type
Box Beam or Girders - Multiple
Steel
Length
211 ft
1 main span
Daily traffic
160
2020 count
Owner
State
State Highway Agency

About this bridge

Irr:nome-Council over Bonanza Channel is a steel box beam or girders - multiple carrying Irr:nome-Council over Bonanza Channel in Nome Census Area, Alaska. It was built in 1977, so it is 48 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 160 vehicles a day, roughly 8% of them trucks, projected to reach 490 by 2039. The structure is 211 ft (64.2 m) long and 25 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesIrr:nome-Council
CrossesBonanza Channel
LocationMile Point 31.6
RouteState Highway 130
CountyNome Census Area
StateAlaska
Coordinates64.54472, -164.43672
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
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 alignment6: Equal to present minimum criteria
Operating rating65.1 US tons
Inventory rating36.9 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialSteel
DeckWood or timber
Main spans1
Design loadHS 20 + Mod
Structure length211 ft (64.2 m)
Longest span188 ft (57.3 m)
Deck width25 ft (7.6 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic160 (2020)
Projected traffic490 by 2039
Trucks8%
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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Irr:nome-Council over Bonanza Channel built?

It was built in 1977, making it 48 years old in 2025.

What condition is Irr:nome-Council over Bonanza Channel 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 August 2024.

How much traffic does Irr:nome-Council over Bonanza Channel carry?

About 160 vehicles per day (2020 count), of which roughly 8% are trucks.

How long is Irr:nome-Council over Bonanza Channel?

The structure is 211 ft (64.2 m) long with a longest span of 188 ft (57.3 m) and a deck 25 ft wide.

Who owns Irr:nome-Council over Bonanza Channel?

It is owned by the State Highway Agency.