Structure 16186 · Jerome County, ID

I 84 Wbl over US 93;w.twin Falls Ic

Carries I 84 Wbl over US 93;w.twin Falls Ic, 3.6 N. Twin Falls.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT161 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 7/9

161 ft end to end, longest span 78 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.

Built200323 years old
Length161.1 ft49.1 m
Daily traffic14,500counted 2023
Last inspectedApril 2021every 48 months

Location

StateIdaho
CountyJerome
Location3.6 N. Twin Falls
CarriesI 84 Wbl
CrossesUS 93;w.twin Falls Ic
Coordinates42.64237, -114.44540

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length161.1 ft (49.1 m)
Max Span78.1 ft (23.8 m)
Deck Width72.8 ft (22.2 m)
Deck Area1090.0 sq m
Main Spans2
Year Built2003

Traffic

Avg Daily Traffic14,500 (2023)
Truck Traffic29%
Lanes On Bridge3
Lanes Under Bridge4

Inspection & Ownership

Last InspectionApril 2021
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour CriticalNot applicable
Structure Number000000000016186

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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