Structure DAPPACTFTBEEBEE · Fairbanks North Star County, AK

Tanana Bridge Road over Boundry Slough

Carries Tanana Bridge Road over Boundry Slough, 1.4 Km W-sw Tanana R Br.

Overall conditionPoor

Set by its lowest-rated component: Deck at 3 of 9.

How ratings work
Decksets the rating3/9 · Serious
Superstructure7/9 · Good
Substructure7/9 · Good
Channelnot part of overall4/9 · Poor
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT121 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 3/9 · sets the ratingSuperstructure 7/9Substructure 7/9

121 ft end to end, longest span 40 ft. 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.

Built201214 years old
Length121.1 ft36.9 m
Daily traffic10counted 2023
Last inspectedAugust 2023every 24 months

Location

StateAlaska
CountyFairbanks North Star
Location1.4 Km W-sw Tanana R Br
CarriesTanana Bridge Road
CrossesBoundry Slough
Coordinates64.54328, -147.09008

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length121.1 ft (36.9 m)
Max Span40.0 ft (12.2 m)
Deck Width29.9 ft (9.1 m)
Deck Area335.8 sq m
Main Spans3
Year Built2012

Traffic

Avg Daily Traffic10 (2023)
Truck Traffic10%
Lanes On Bridge2

Inspection & Ownership

Last InspectionAugust 2023
Inspection FrequencyEvery 24 months
OwnerArmy
Historical SignificanceBridge is not eligible for the National Register
Scour Critical6 — Scour calculated, stable
Structure NumberDAPPACTFTBEEBEE

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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