Structure 83883000000000 · Kittitas County, WA

Thrall Road over Cherry Creek

Carries Thrall Road over Cherry Creek, 00.05 E No. 6 Road.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT189 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

189 ft end to end, longest span 42 ft: about 3 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 slab bridge.

Built196957 years old
Length189.0 ft57.6 m
Daily traffic2,000counted 2023
Last inspectedSeptember 2024every 24 months

Location

StateWashington
CountyKittitas
Location00.05 E No. 6 Road
CarriesThrall Road
CrossesCherry Creek
Coordinates46.92623, -120.49553

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length189.0 ft (57.6 m)
Max Span42.0 ft (12.8 m)
Deck Width41.3 ft (12.6 m)
Deck Area725.8 sq m
Main Spans3
Year Built1969

Traffic

Avg Daily Traffic2,000 (2023)
Truck Traffic26%
Lanes On Bridge2

Inspection & Ownership

Last InspectionSeptember 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical5 — Stable for scour
Structure Number083883000000000

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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