Structure 10900 · Bannock County, ID

I 86 Ebl over Uprr;chubbuck Overpass

Carries I 86 Ebl over Uprr;chubbuck Overpass, 0.4 E. Chubbuck.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT170 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 6/9 · sets the rating

170 ft end to end, longest span 71 ft: about 2 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.

Built196363 years old
Length169.9 ft51.8 m
Daily traffic11,750counted 2023
Last inspectedAugust 2022every 48 months

Location

StateIdaho
CountyBannock
Location0.4 E. Chubbuck
CarriesI 86 Ebl
CrossesUprr;chubbuck Overpass
Coordinates42.91258, -112.45906

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length169.9 ft (51.8 m)
Max Span70.9 ft (21.6 m)
Deck Width53.1 ft (16.2 m)
Deck Area839.2 sq m
Main Spans3
Year Built1963

Traffic

Avg Daily Traffic11,750 (2023)
Truck Traffic15%
Lanes On Bridge3

Inspection & Ownership

Last InspectionAugust 2022
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour CriticalNot applicable
Structure Number000000000010900

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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