Old 66 over Wash

Fair

Yavapai County, Arizona · 13.4 MI W of JCT I 40 · Structure no. 07755

Built: 1936; 89 years old, rebuilt 1972
Condition: Fair; inspected July 2023
Type: Culvert; Concrete Continuous
Length: 43 ft; 4 main spans
Daily traffic: 393; 2021 count
Owner: County; County Highway Agency

About this bridge

Old 66 over Wash is a concrete continuous culvert carrying Old 66 over Wash in Yavapai County, Arizona. It was built in 1936 and reconstructed in 1972, so it is 89 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 393 vehicles a day, roughly 7% of them trucks, projected to reach 403 by 2039. The structure is 43 ft (13.1 m) long. If it were closed, the detour would be 19.3 mi (31 km).

Location

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CarriesOld 66

CrossesWash

Location13.4 MI W of JCT I 40

RouteCounty Highway 0

CountyYavapai County

StateArizona

Coordinates35.43594, -113.07122

Functional classRural Major Collector

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	7 Good	Some minor problems.
Culvert	6 Satisfactory	Structural elements show some minor deterioration.

Last inspectionJuly 2023

Inspection intervalevery 48 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation6: Equal to present minimum criteria

Waterway adequacy8: Equal to present desirable criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating70 US tons

Inventory rating42 US tons

Structure

Structure typeCulvert

MaterialConcrete Continuous

DeckNot applicable

Main spans4

Design loadHS 20

Structure length43 ft (13.1 m)

Longest span10 ft (3 m)

Deck width0 ft (0 m)

Roadway width0 ft (0 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic393 (2021)

Projected traffic403 by 2039

Trucks7%

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed19.3 mi (31 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 66 over Wash built?

It was built in 1936, making it 89 years old in 2025. It was reconstructed in 1972.

What condition is Old 66 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 July 2023.

How much traffic does Old 66 over Wash carry?

About 393 vehicles per day (2021 count), of which roughly 7% are trucks.

How long is Old 66 over Wash?

The structure is 43 ft (13.1 m) long with a longest span of 10 ft (3 m).

Who owns Old 66 over Wash?

It is owned by the County Highway Agency.