Structure 15950 · Elmore County, ID

I 84 Ebl over Canyon Cr;glenns Ferry

Carries I 84 Ebl over Canyon Cr;glenns Ferry, At Glenns Ferry Ncl.

Overall conditionFair

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

How ratings work
Deck7/9 · 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
CAR · 15 FT74 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 8/9Substructure 6/9 · sets the rating

74 ft end to end. 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.

Built197650 years old
Length74.1 ft22.6 m
Daily traffic9,750counted 2023
Last inspectedAugust 2021every 48 months

Location

StateIdaho
CountyElmore
LocationAt Glenns Ferry Ncl
CarriesI 84 Ebl
CrossesCanyon Cr;glenns Ferry
Coordinates42.96057, -115.30452

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length74.1 ft (22.6 m)
Max Span70.9 ft (21.6 m)
Deck Width43.6 ft (13.3 m)
Deck Area300.6 sq m
Main Spans1
Year Built1976

Traffic

Avg Daily Traffic9,750 (2023)
Truck Traffic30%
Lanes On Bridge2

Inspection & Ownership

Last InspectionAugust 2021
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical9 — Foundation above flood level
Structure Number000000000015950

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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