Structure 29285 · Idaho County, ID

Stc 4718;selway RD over Lochsa River(lowell Br)

Carries Stc 4718;selway RD over Lochsa River(lowell Br), 0.1 N. 18.2 E. Kooskia.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructuresets the rating6/9 · Satisfactory
Substructuresets the rating6/9 · Satisfactory
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT318 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 6/9 · sets the ratingSubstructure 6/9 · sets the rating

318 ft end to end, longest span 98 ft: about 4 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.

Built196066 years old
Length317.9 ft96.9 m
Daily traffic320counted 2023
Last inspectedJune 2024every 24 months

Location

StateIdaho
CountyIdaho
Location0.1 N. 18.2 E. Kooskia
CarriesStc 4718;selway RD
CrossesLochsa River(lowell Br)
Coordinates46.14302, -115.59727

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length317.9 ft (96.9 m)
Max Span98.1 ft (29.9 m)
Deck Width30.5 ft (9.3 m)
Deck Area901.2 sq m
Main Spans5
Year Built1960

Traffic

Avg Daily Traffic320 (2023)
Truck Traffic10%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJune 2024
Inspection FrequencyEvery 24 months
OwnerOther Local Agencies
Historical SignificanceHistorical significance is not determined
Scour Critical4 — Foundations need monitoring
Structure Number000000000029285

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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