Structure 8753 · Pima County, AZ

Thornydale Road over Canada Del Oro Wash

Carries Thornydale Road over Canada Del Oro Wash, 0.3 Mi S Jct Ina RD.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructure7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT323 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 7/9

323 ft end to end, longest span 80 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.

Built1982rebuilt 1998
Length323.2 ft98.5 m
Daily traffic32,172counted 2024
Last inspectedJuly 2024every 24 months

Location

StateArizona
CountyPima
Location0.3 Mi S Jct Ina RD
CarriesThornydale Road
CrossesCanada Del Oro Wash
Coordinates32.33330, -111.04636

Physical Characteristics

MaterialPrestressed Concrete Continuous
DesignStringer/Multi-beam
Total Length323.2 ft (98.5 m)
Max Span80.1 ft (24.4 m)
Deck Width132.9 ft (40.5 m)
Deck Area3989.2 sq m
Main Spans4
Year Built1982 (reconstructed 1998)

Traffic

Avg Daily Traffic32,172 (2024)
Truck Traffic5%
Lanes On Bridge6

Inspection & Ownership

Last InspectionJuly 2024
Inspection FrequencyEvery 24 months
OwnerTown/Township Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number08753

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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