Structure 117 · La Paz County, AZ

US 60 over Centennial Wash

Carries US 60 over Centennial Wash, 12.4 Mi East Of Jct SR 72.

Overall conditionPoor

Set by its lowest-rated component: Deck at 4 of 9.

How ratings work
Decksets the rating4/9 · Poor
Superstructure7/9 · Good
Substructure6/9 · Satisfactory
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT504 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 4/9 · sets the ratingSuperstructure 7/9Substructure 6/9

504 ft end to end, longest span 36 ft: about 7 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.

Built1934rebuilt 1958
Length503.9 ft153.6 m
Daily traffic2,097counted 2022
Last inspectedAugust 2024every 24 months

Location

StateArizona
CountyLa Paz
Location12.4 Mi East Of Jct SR 72
CarriesUS 60
CrossesCentennial Wash
Coordinates33.82420, -113.53350

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length503.9 ft (153.6 m)
Max Span36.1 ft (11 m)
Deck Width35.1 ft (10.7 m)
Deck Area1643.5 sq m
Main Spans13
Year Built1934 (reconstructed 1958)

Traffic

Avg Daily Traffic2,097 (2022)
Truck Traffic13%
Lanes On Bridge2

Inspection & Ownership

Last InspectionAugust 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number00117

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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