Structure 309 · Skagway County, AK

Dyea Road over Taiya River

Carries Dyea Road over Taiya River, Mile Point 7.1.

Overall conditionFair

Set by its lowest-rated component: Substructure at 5 of 9.

How ratings work
Deck9/9 · Excellent
Superstructure6/9 · Satisfactory
Substructuresets the rating5/9 · Fair
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT205 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 9/9Superstructure 6/9Substructure 5/9 · sets the rating

205 ft end to end: about 3 semi-trucks nose to tail. Lengths and the semi-truck on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a through truss.

Built1948rebuilt 2011
Length204.7 ft62.4 m
Daily traffic238counted 2018
Last inspectedMay 2024every 24 months

Location

StateAlaska
CountySkagway
LocationMile Point 7.1
CarriesDyea Road
CrossesTaiya River
Coordinates59.51226, -135.34716

Physical Characteristics

MaterialSteel
DesignTruss - Thru
Total Length204.7 ft (62.4 m)
Max Span200.1 ft (61 m)
Deck Width14.4 ft (4.4 m)
Deck Area274.6 sq m
Main Spans1
Year Built1948 (reconstructed 2011)

Traffic

Avg Daily Traffic238 (2018)
Truck Traffic14%
Lanes On Bridge1

Inspection & Ownership

Last InspectionMay 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number0309

How Bridge Ratings Work

Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."

0Failed
1Imminent failure
2Critical
3Serious
4Poor
5Fair
6Satisfactory
7Good
8Very good
9Excellent
Good · lowest component 7–9
Fair · lowest component 5–6
Poor · lowest component 0–4

A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.

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