Structure 8893 · Pima County, AZ

Kolb Road over Drainageway

Carries Kolb Road over Drainageway, 0.2 Mi S Of I 10.

Overall conditionFair

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

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

Elevation

Side view, colored by inspection rating
21 FT ACROSS25 FT0ELEVATION · LENGTHS TO SCALE
Culvert 6/9

A culvert 21 ft across with 4 openings. Lengths are drawn to scale; at this length a semi-truck would be a speck. Each part is colored by its latest inspection rating. The inventory records lengths but not heights, so those are drawn as typical for a culvert.

Built198541 years old
Length21.0 ft6.4 m
Daily traffic7,191counted 2023
Last inspectedNovember 2023every 48 months

Location

StateArizona
CountyPima
Location0.2 Mi S Of I 10
CarriesKolb Road
CrossesDrainageway
Coordinates32.09873, -110.84112

Physical Characteristics

MaterialSteel
DesignCulvert
Total Length21.0 ft (6.4 m)
Max Span3.9 ft (1.2 m)
Deck Width40.0 ft (12.2 m)
Deck Area78.1 sq m
Main Spans4
Year Built1985

Traffic

Avg Daily Traffic7,191 (2023)
Truck Traffic1%
Lanes On Bridge2

Inspection & Ownership

Last InspectionNovember 2023
Inspection FrequencyEvery 48 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number08893

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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