US 93 NB over Big Wash

Fair

Mohave County, Arizona · 15.6 MI N of JCT SR 68 · Structure no. 02373

Built: 1992; 33 years old
Condition: Fair; inspected October 2023
Type: Slab; Concrete Continuous
Length: 166 ft; 5 main spans
Daily traffic: 7,819; 2022 count
Owner: State; State Highway Agency

About this bridge

US 93 NB over Big Wash is a concrete continuous slab carrying US 93 NB over Big Wash in Mohave County, Arizona. It was built in 1992, so it is 33 years old, younger than the Arizona average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 7,819 vehicles a day, roughly 26% of them trucks, projected to reach 7,829 by 2042. The structure is 166 ft (50.6 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesUS 93 NB

CrossesBig Wash

Location15.6 MI N of JCT SR 68

RouteU.S. Route 93

CountyMohave County

StateArizona

Coordinates35.4125, -114.2705

Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

Component	Rating	Meaning
Deck	6 Satisfactory	Structural elements show some minor deterioration.
Superstructure	6 Satisfactory	Structural elements show some minor deterioration.
Substructure	7 Good	Some minor problems.
Channel and channel protection	7 Good	Some minor problems.

Last inspectionOctober 2023

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation6: Equal to present minimum criteria

Deck geometry7: Better than present minimum criteria

Waterway adequacy8: Equal to present desirable criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating99 US tons

Inventory rating65 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans5

Design loadHS 20

Structure length166 ft (50.6 m)

Longest span35 ft (10.7 m)

Deck width43 ft (13.2 m)

Roadway width40 ft (12.2 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,819 (2022)

Projected traffic7,829 by 2042

Trucks26%

Lanes on structure2

Traffic directionOne-way traffic

CarriesHighway

CrossesWaterway

Detour if closed1.2 mi (2 km)

TollOn a free road

National Highway SystemYes

Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency

Maintained byState Highway Agency

Historic statusNot eligible for the National Register of Historic Places

Work proposedNone recorded

Estimated improvement cost—

NavigationNo navigation control on waterway

Frequently asked questions

When was US 93 NB over Big Wash built?

It was built in 1992, making it 33 years old in 2025.

What condition is US 93 NB over Big Wash in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in October 2023.

How much traffic does US 93 NB over Big Wash carry?

About 7,819 vehicles per day (2022 count), of which roughly 26% are trucks.

How long is US 93 NB over Big Wash?

The structure is 166 ft (50.6 m) long with a longest span of 35 ft (10.7 m) and a deck 43 ft wide.

Who owns US 93 NB over Big Wash?

It is owned by the State Highway Agency.