Old US 91 over Wash

Fair

Mohave County, Arizona · 1.7 MI SW JCT I 15 · Structure no. 08659

Built: 1929; 96 years old, rebuilt 1932
Condition: Fair; inspected August 2023
Type: Culvert; Concrete Continuous
Length: 21 ft; 2 main spans
Daily traffic: 659; 2021 count
Owner: County; County Highway Agency

About this bridge

Old US 91 over Wash is a concrete continuous culvert carrying Old US 91 over Wash in Mohave County, Arizona. It was built in 1929 and reconstructed in 1932, so it is 96 years old, older 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 659 vehicles a day, roughly 1% of them trucks, projected to reach 669 by 2041. The structure is 21 ft (6.4 m) long and 26 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

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CarriesOld US 91

CrossesWash

Location1.7 MI SW JCT I 15

RouteCounty Highway 0

CountyMohave County

StateArizona

Coordinates36.8756, -113.9494

Functional classRural Local

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
Channel and channel protection	6 Satisfactory	Structural elements show some minor deterioration.
Culvert	6 Satisfactory	Structural elements show some minor deterioration.

Last inspectionAugust 2023

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation6: Equal to present minimum criteria

Deck geometry4: Meets minimum tolerable limits to be left in place as is

Waterway adequacy6: Equal to present minimum criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating59 US tons

Inventory rating35.1 US tons

Structure

Structure typeCulvert

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans2

Design loadH 15

Structure length21 ft (6.4 m)

Longest span10 ft (3 m)

Deck width26 ft (7.8 m)

Roadway width24 ft (7.3 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic659 (2021)

Projected traffic669 by 2041

Trucks1%

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed11.8 mi (19 km)

TollOn a free road

National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency

Maintained byCounty 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 Old US 91 over Wash built?

It was built in 1929, making it 96 years old in 2025. It was reconstructed in 1932.

What condition is Old US 91 over 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 August 2023.

How much traffic does Old US 91 over Wash carry?

About 659 vehicles per day (2021 count), of which roughly 1% are trucks.

How long is Old US 91 over Wash?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m) and a deck 26 ft wide.

Who owns Old US 91 over Wash?

It is owned by the County Highway Agency.