Structure 15CAS002 · Valley County, ID

Lake Way over North Fork Payette River

Carries Lake Way over North Fork Payette River, Downstream Of Cascade Dam.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating5/9 · Fair
Channelnot part of overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT104 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 5/9 · sets the rating

104 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.

Built1913113 years old
Length103.7 ft31.6 m
Daily traffic100counted 2022
Last inspectedSeptember 2024every 24 months

Location

StateIdaho
CountyValley
LocationDownstream Of Cascade Dam
CarriesLake Way
CrossesNorth Fork Payette River
Coordinates44.52470, -116.04640

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length103.7 ft (31.6 m)
Max Span97.8 ft (29.8 m)
Deck Width14.1 ft (4.3 m)
Deck Area135.9 sq m
Main Spans1
Year Built1913

Traffic

Avg Daily Traffic100 (2022)
Truck Traffic10%
Lanes On Bridge1

Inspection & Ownership

Last InspectionSeptember 2024
Inspection FrequencyEvery 24 months
OwnerBureau of Reclamation
Historical SignificanceBridge is eligible for the National Register
Scour Critical4 — Foundations need monitoring
Structure Number15CAS002

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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