US Bridges

Irr:nome-Council over Safety Sound Estuary

Fair

Nome Census Area, Alaska · Mile Point 20.8 · Structure no. 1127

Built
1978
47 years old
Condition
Fair
inspected August 2024
Type
Tee Beam
Prestressed Concrete
Length
807 ft
7 main spans
Daily traffic
160
2020 count
Owner
State
State Highway Agency

About this bridge

Irr:nome-Council over Safety Sound Estuary is a prestressed concrete tee beam carrying Irr:nome-Council over Safety Sound Estuary in Nome Census Area, Alaska. It was built in 1978, so it is 47 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 807 ft (246.1 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
CrossesSafety Sound Estuary
LocationMile Point 20.8
RouteState Highway 130
CountyNome Census Area
StateAlaska
Coordinates64.47208, -164.74686
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.6 US tons
Inventory rating41.1 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans7
Design loadHS 20
Structure length807 ft (246.1 m)
Longest span115 ft (35.1 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Irr:nome-Council over Safety Sound Estuary built?

It was built in 1978, making it 47 years old in 2025.

What condition is Irr:nome-Council over Safety Sound Estuary 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 Safety Sound Estuary carry?

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

How long is Irr:nome-Council over Safety Sound Estuary?

The structure is 807 ft (246.1 m) long with a longest span of 115 ft (35.1 m) and a deck 25 ft wide.

Who owns Irr:nome-Council over Safety Sound Estuary?

It is owned by the State Highway Agency.