Structure 12535 · Madison County, ID

US 20 Wbl over Stp 7726;s.rexburg Ic

Carries US 20 Wbl over Stp 7726;s.rexburg Ic, 1.5 S. Rexburg.

Overall conditionGood

Set by its lowest-rated component: Deck and Superstructure and Substructure at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructuresets the rating7/9 · Good
Substructuresets the rating7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT157 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

157 ft end to end, longest span 98 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 box-beam bridge.

Built198145 years old
Length157.2 ft47.9 m
Daily traffic15,750counted 2023
Last inspectedMay 2022every 48 months

Location

StateIdaho
CountyMadison
Location1.5 S. Rexburg
CarriesUS 20 Wbl
CrossesStp 7726;s.rexburg Ic
Coordinates43.80474, -111.81345

Physical Characteristics

MaterialPrestressed Concrete
DesignBox Beam - Single/Spread
Total Length157.2 ft (47.9 m)
Max Span98.1 ft (29.9 m)
Deck Width43.6 ft (13.3 m)
Deck Area637.1 sq m
Main Spans3
Year Built1981

Traffic

Avg Daily Traffic15,750 (2023)
Truck Traffic8%
Lanes On Bridge2
Lanes Under Bridge4

Inspection & Ownership

Last InspectionMay 2022
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour CriticalNot applicable
Structure Number000000000012535

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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