US Bridges

Dyea Road over Taiya River

Fair

Skagway Municipality, Alaska · Mile Point 7.1 · Structure no. 0309

Built
1948
77 years old, rebuilt 2011
Condition
Fair
inspected May 2024
Type
Truss - Thru
Steel
Length
205 ft
1 main span
Daily traffic
238
2018 count
Owner
State
State Highway Agency

About this bridge

Dyea Road over Taiya River is a steel truss - thru carrying Dyea Road over Taiya River in Skagway Municipality, Alaska. It was built in 1948 and reconstructed in 2011, so it is 77 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 238 vehicles a day, roughly 14% of them trucks, projected to reach 350 by 2035. The structure is 205 ft (62.4 m) long and 14 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesDyea Road
CrossesTaiya River
LocationMile Point 7.1
RouteState Highway 997
CountySkagway Municipality
StateAlaska
Coordinates59.51226, -135.34716
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
Deck9 ExcellentNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating75.2 US tons
Inventory rating34.7 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadH 15
Structure length205 ft (62.4 m)
Longest span200 ft (61 m)
Deck width14 ft (4.4 m)
Roadway width13 ft (4.1 m)
Vertical clearance over deck12 ft (3.5 m)

Traffic and service

Average daily traffic238 (2018)
Projected traffic350 by 2035
Trucks14%
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 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 Dyea Road over Taiya River built?

It was built in 1948, making it 77 years old in 2025. It was reconstructed in 2011.

What condition is Dyea Road over Taiya 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 Dyea Road over Taiya River carry?

About 238 vehicles per day (2018 count), of which roughly 14% are trucks.

How long is Dyea Road over Taiya River?

The structure is 205 ft (62.4 m) long with a longest span of 200 ft (61 m) and a deck 14 ft wide.

Who owns Dyea Road over Taiya River?

It is owned by the State Highway Agency.