Structure 32785 · Madison County, ID

N 3600 E over Combined Snake Rivers

Carries N 3600 E over Combined Snake Rivers, 5.1 S. 9.6 W. Rexburg.

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
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT340 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 6/9 · sets the rating

340 ft end to end, longest span 105 ft: about 5 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.

Built196858 years old
Length339.9 ft103.6 m
Daily traffic270counted 2023
Last inspectedOctober 2024every 24 months

Location

StateIdaho
CountyMadison
Location5.1 S. 9.6 W. Rexburg
CarriesN 3600 E
CrossesCombined Snake Rivers
Coordinates43.75206, -111.98031

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length339.9 ft (103.6 m)
Max Span105.0 ft (32 m)
Deck Width29.9 ft (9.1 m)
Deck Area942.8 sq m
Main Spans3
Year Built1968

Traffic

Avg Daily Traffic270 (2023)
Truck Traffic10%
Lanes On Bridge2

Inspection & Ownership

Last InspectionOctober 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical4 — Foundations need monitoring
Structure Number000000000032785

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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