US Bridges

Dalton Trail Spur over Little Salmon River

Fair

Haines Borough, Alaska · Mile Point 3.2 · Structure no. 1630

Built
2009
16 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
61 ft
1 main span
Daily traffic
10
2018 count
Owner
State
State Park, Forest, or Reservation Agency

About this bridge

Dalton Trail Spur over Little Salmon River is a steel stringer/multi-beam or girder carrying Dalton Trail Spur over Little Salmon River in Haines Borough, Alaska. It was built in 2009, so it is 16 years old, younger 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 10 vehicles a day, roughly 1% of them trucks, projected to reach 12 by 2035. The structure is 61 ft (18.6 m) long and 19 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesDalton Trail Spur
CrossesLittle Salmon River
LocationMile Point 3.2
StateAlaska
Coordinates59.383, -136.068
Functional classRural Local

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating78.2 US tons
Inventory rating36 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 20 + Mod
Structure length61 ft (18.6 m)
Longest span59 ft (18.1 m)
Deck width19 ft (5.8 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2018)
Projected traffic12 by 2035
Trucks1%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Park, Forest, or Reservation Agency
Maintained byState Park, Forest, or Reservation 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 Dalton Trail Spur over Little Salmon River built?

It was built in 2009, making it 16 years old in 2025.

What condition is Dalton Trail Spur over Little Salmon 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 May 2024.

How much traffic does Dalton Trail Spur over Little Salmon River carry?

About 10 vehicles per day (2018 count), of which roughly 1% are trucks.

How long is Dalton Trail Spur over Little Salmon River?

The structure is 61 ft (18.6 m) long with a longest span of 59 ft (18.1 m) and a deck 19 ft wide.

Who owns Dalton Trail Spur over Little Salmon River?

It is owned by the State Park, Forest, or Reservation Agency.