Structure 267 · Greenlee County, AZ

US 191 NB over Niger Canyon

Carries US 191 NB over Niger Canyon, 3.2 Mi N Jct SR 75.

Overall conditionFair

Set by its lowest-rated component: Deck and Superstructure at 5 of 9.

How ratings work
Decksets the rating5/9 · Fair
Superstructuresets the rating5/9 · Fair
Substructure6/9 · Satisfactory
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT110 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9 · sets the ratingSuperstructure 5/9 · sets the ratingSubstructure 6/9

110 ft end to end, longest span 27 ft. 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 slab bridge.

Built194284 years old
Length109.9 ft33.5 m
Daily traffic5,190counted 2022
Last inspectedAugust 2023every 24 months

Location

StateArizona
CountyGreenlee
Location3.2 Mi N Jct SR 75
CarriesUS 191 NB
CrossesNiger Canyon
Coordinates32.98291, -109.25974

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length109.9 ft (33.5 m)
Max Span26.9 ft (8.2 m)
Deck Width28.9 ft (8.8 m)
Deck Area294.8 sq m
Main Spans4
Year Built1942

Traffic

Avg Daily Traffic5,190 (2022)
Truck Traffic7%
Lanes On Bridge2

Inspection & Ownership

Last InspectionAugust 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical3 — Scour critical
Structure Number00267

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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