Structure 11340 · Bannock County, ID

I 15 Sbl over Fort Hall Main Canal

Carries I 15 Sbl over Fort Hall Main Canal, 9.8 N. Pocatello.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT112 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

112 ft end to end, longest span 49 ft. Lengths and the car 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.

Built196066 years old
Length111.9 ft34.1 m
Daily traffic14,250counted 2023
Last inspectedMarch 2024every 24 months

Location

StateIdaho
CountyBannock
Location9.8 N. Pocatello
CarriesI 15 Sbl
CrossesFort Hall Main Canal
Coordinates43.01236, -112.40833

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length111.9 ft (34.1 m)
Max Span48.9 ft (14.9 m)
Deck Width40.0 ft (12.2 m)
Deck Area416.0 sq m
Main Spans3
Year Built1960

Traffic

Avg Daily Traffic14,250 (2023)
Truck Traffic18%
Lanes On Bridge2

Inspection & Ownership

Last InspectionMarch 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical8 — Stable, low risk
Structure Number000000000011340

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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