US Bridges

Irr:nknk-Kng Salmn over King Salmon Creek

Good

Bristol Bay Borough, Alaska · Mile Point 13.0 · Structure no. 0399

Built
1960
65 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
151 ft
3 main spans
Daily traffic
760
2020 count
Owner
State
State Highway Agency

About this bridge

Irr:nknk-Kng Salmn over King Salmon Creek is a steel stringer/multi-beam or girder carrying Irr:nknk-Kng Salmn over King Salmon Creek in Bristol Bay Borough, Alaska. It was built in 1960, so it is 65 years old, older than the Alaska average of 35.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 760 vehicles a day, roughly 21% of them trucks, projected to reach 920 by 2039. The structure is 151 ft (46.1 m) long and 37 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesIrr:nknk-Kng Salmn
CrossesKing Salmon Creek
LocationMile Point 13.0
RouteState Highway 380
CountyBristol Bay Borough
StateAlaska
Coordinates58.69609, -156.69791
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck9 ExcellentNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than 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 rating59.2 US tons
Inventory rating35.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans3
Design loadHS 20
Structure length151 ft (46.1 m)
Longest span59 ft (18 m)
Deck width37 ft (11.3 m)
Roadway width35 ft (10.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic760 (2020)
Projected traffic920 by 2039
Trucks21%
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:nknk-Kng Salmn over King Salmon Creek built?

It was built in 1960, making it 65 years old in 2025.

What condition is Irr:nknk-Kng Salmn over King Salmon Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2024.

How much traffic does Irr:nknk-Kng Salmn over King Salmon Creek carry?

About 760 vehicles per day (2020 count), of which roughly 21% are trucks.

How long is Irr:nknk-Kng Salmn over King Salmon Creek?

The structure is 151 ft (46.1 m) long with a longest span of 59 ft (18 m) and a deck 37 ft wide.

Who owns Irr:nknk-Kng Salmn over King Salmon Creek?

It is owned by the State Highway Agency.