Structure 13416 · Lemhi County, ID

SH 28 over Lemhi River

Carries SH 28 over Lemhi River, 1.4 S. Tendoy.

Overall conditionGood

Set by its lowest-rated component: Deck and Superstructure and Substructure at 8 of 9.

How ratings work
Decksets the rating8/9 · Very Good
Superstructuresets the rating8/9 · Very Good
Substructuresets the rating8/9 · Very Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT83 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 8/9Substructure 8/9

83 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 slab bridge.

Built20197 years old
Length83.0 ft25.3 m
Daily traffic860counted 2023
Last inspectedAugust 2022every 48 months

Location

StateIdaho
CountyLemhi
Location1.4 S. Tendoy
CarriesSH 28
CrossesLemhi River
Coordinates44.93983, -113.63922

Physical Characteristics

MaterialPrestressed Concrete
DesignSlab
Total Length83.0 ft (25.3 m)
Max Span79.4 ft (24.2 m)
Deck Width44.0 ft (13.4 m)
Deck Area339.0 sq m
Main Spans1
Year Built2019

Traffic

Avg Daily Traffic860 (2023)
Truck Traffic25%
Lanes On Bridge2

Inspection & Ownership

Last InspectionAugust 2022
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical8 — Stable, low risk
Structure Number000000000013416

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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