Structure 1112 · Yakutat City and County, AK

Irr:ocean Cape RD over Ankau Slough

Carries Irr:ocean Cape RD over Ankau Slough, Mile Point 4.6.

Overall conditionPoor

Set by its lowest-rated component: Substructure at 4 of 9.

How ratings work
Deck6/9 · Satisfactory
Superstructure6/9 · Satisfactory
Substructuresets the rating4/9 · Poor
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT495 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 6/9Substructure 4/9 · sets the rating

495 ft end to end, longest span 13 ft: about 7 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 multi-beam bridge.

Built196165 years old
Length495.1 ft150.9 m
Daily traffic457counted 2018
Last inspectedMay 2024every 24 months

Location

StateAlaska
CountyYakutat City and
LocationMile Point 4.6
CarriesIrr:ocean Cape RD
CrossesAnkau Slough
Coordinates59.54584, -139.82382

Physical Characteristics

MaterialWood or Timber
DesignStringer/Multi-beam
Total Length495.1 ft (150.9 m)
Max Span13.1 ft (4 m)
Deck Width13.1 ft (4 m)
Deck Area603.6 sq m
Main Spans38
Year Built1961

Traffic

Avg Daily Traffic457 (2018)
Truck Traffic1%
Lanes On Bridge1

Inspection & Ownership

Last InspectionMay 2024
Inspection FrequencyEvery 24 months
OwnerCity/Municipal Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalUnknown
Structure Number1112

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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