Structure 61708000001526 · Kittitas County, WA

Little Naches Road over Little Naches

Carries Little Naches Road over Little Naches, Below 1906.

Overall conditionGood

Set by its lowest-rated component: Deck and Superstructure and Substructure at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructuresets the rating7/9 · Good
Substructuresets the rating7/9 · Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT120 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

120 ft end to end, longest span 80 ft. 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 rigid-frame bridge.

Built1966rebuilt 1994
Length120.1 ft36.6 m
Daily traffic80counted 1991
Last inspectedOctober 2021every 48 months

Location

StateWashington
CountyKittitas
LocationBelow 1906
CarriesLittle Naches Road
CrossesLittle Naches
Coordinates47.06361, -121.21806

Physical Characteristics

MaterialConcrete Continuous
DesignFrame
Total Length120.1 ft (36.6 m)
Max Span80.1 ft (24.4 m)
Deck Width30.5 ft (9.3 m)
Deck Area340.4 sq m
Main Spans3
Year Built1966 (reconstructed 1994)

Traffic

Avg Daily Traffic80 (1991)
Lanes On Bridge2

Inspection & Ownership

Last InspectionOctober 2021
Inspection FrequencyEvery 48 months
OwnerU.S. Forest Service
Historical SignificanceHistorical significance is not determined
Scour Critical5 — Stable for scour
Structure Number061708000001526

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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