Structure 30505000003369 · Pima County, AZ

Control Road over Stratton Canyon

Carries Control Road over Stratton Canyon, 6.9 Mi Ne/o Mt Lemmon.

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
CAR · 15 FT31 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 7/9

31 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.

Built195076 years old
Length30.5 ft9.3 m
Daily traffic80counted 2022
Last inspectedApril 2024every 24 months

Location

StateArizona
CountyPima
Location6.9 Mi Ne/o Mt Lemmon
CarriesControl Road
CrossesStratton Canyon
Coordinates32.49447, -110.68483

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length30.5 ft (9.3 m)
Max Span29.5 ft (9 m)
Deck Width15.7 ft (4.8 m)
Deck Area44.6 sq m
Main Spans1
Year Built1950

Traffic

Avg Daily Traffic80 (2022)
Lanes On Bridge1

Inspection & Ownership

Last InspectionApril 2024
Inspection FrequencyEvery 24 months
OwnerU.S. Forest Service
Historical SignificanceHistorical significance is not determined
Scour Critical4 — Foundations need monitoring
Structure Number030505000003369

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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