Structure 10905 · La Paz County, AZ

W Main ST over Tyson Wash

Carries W Main ST over Tyson Wash, 0.2 Mi W Jct US 95.

Overall conditionFair

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

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

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT399 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 6/9 · sets the rating

399 ft end to end, longest span 33 ft: about 6 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 box-beam bridge.

Built1981rebuilt 2005
Length399.0 ft121.6 m
Daily traffic3,605counted 2021
Last inspectedMarch 2023every 24 months

Location

StateArizona
CountyLa Paz
Location0.2 Mi W Jct US 95
CarriesW Main ST
CrossesTyson Wash
Coordinates33.66614, -114.22128

Physical Characteristics

MaterialPrestressed Concrete
DesignBox Beam - Multiple
Total Length399.0 ft (121.6 m)
Max Span33.1 ft (10.1 m)
Deck Width84.0 ft (25.6 m)
Deck Area3113.0 sq m
Main Spans12
Year Built1981 (reconstructed 2005)

Traffic

Avg Daily Traffic3,605 (2021)
Truck Traffic38%
Lanes On Bridge4

Inspection & Ownership

Last InspectionMarch 2023
Inspection FrequencyEvery 24 months
OwnerTown/Township Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical7 — Countermeasures installed
Structure Number10905

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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