Structure 10406000000144 · Bonner County, ID

Fs Route No. 419 over Lightning Creek

Carries Fs Route No. 419 over Lightning Creek, Lightning Creek.

Overall conditionFair

Set by its lowest-rated component: Substructure at 5 of 9.

How ratings work
Deck6/9 · Satisfactory
Superstructure7/9 · Good
Substructuresets the rating5/9 · Fair
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT51 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 7/9Substructure 5/9 · sets the rating

51 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 multi-beam bridge.

Built195670 years old
Length50.9 ft15.5 m
Daily traffic40counted 2018
Last inspectedAugust 2024every 24 months

Location

StateIdaho
CountyBonner
LocationLightning Creek
CarriesFs Route No. 419
CrossesLightning Creek
Coordinates48.38280, -116.15579

Physical Characteristics

MaterialWood or Timber
DesignStringer/Multi-beam
Total Length50.9 ft (15.5 m)
Max Span49.2 ft (15 m)
Deck Width15.4 ft (4.7 m)
Deck Area72.8 sq m
Main Spans1
Year Built1956

Traffic

Avg Daily Traffic40 (2018)
Lanes On Bridge1

Inspection & Ownership

Last InspectionAugust 2024
Inspection FrequencyEvery 24 months
OwnerU.S. Forest Service
Historical SignificanceHistorical significance is not determined
Scour Critical5 — Stable for scour
Structure Number010406000000144

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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