Structure 649 · County 066 County, AK

Tok Cutoff over Chistochina River

Carries Tok Cutoff over Chistochina River, Mile Point 34.8.

Overall conditionFair

Set by its lowest-rated component: Substructure at 6 of 9.

How ratings work
Deck8/9 · Very Good
Superstructure8/9 · Very Good
Substructuresets the rating6/9 · Satisfactory
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT798 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 8/9Substructure 6/9 · sets the rating

798 ft end to end, longest span 113 ft: about 2.2 football fields. 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 tee-beam bridge.

Built200521 years old
Length798.2 ft243.3 m
Daily traffic330counted 2020
Last inspectedJuly 2023every 24 months

Location

StateAlaska
CountyCounty 066
LocationMile Point 34.8
CarriesTok Cutoff
CrossesChistochina River
Coordinates62.60139, -144.64028

Physical Characteristics

MaterialPrestressed Concrete
DesignTee Beam
Total Length798.2 ft (243.3 m)
Max Span112.9 ft (34.4 m)
Deck Width39.0 ft (11.9 m)
Deck Area2895.3 sq m
Main Spans7
Year Built2005

Traffic

Avg Daily Traffic330 (2020)
Truck Traffic21%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJuly 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number0649

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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