US Bridges

IRR SR 66 over Wash

Fair

Mohave County, Arizona · 36.7 MI E JCT I 40 · Structure no. 04235

Built
1935
90 years old, rebuilt 1962
Condition
Fair
inspected November 2022
Type
Culvert
Concrete Continuous
Length
32 ft
3 main spans
Daily traffic
1,643
2017 count
Owner
State
State Highway Agency

About this bridge

IRR SR 66 over Wash is a concrete continuous culvert carrying IRR SR 66 over Wash in Mohave County, Arizona. It was built in 1935 and reconstructed in 1962, so it is 90 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 1,643 vehicles a day, roughly 15% of them trucks, projected to reach 1,653 by 2037. The structure is 32 ft (9.8 m) long. If it were closed, the detour would be 19.3 mi (31 km).

Location

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CarriesIRR SR 66
CrossesWash
Location36.7 MI E JCT I 40
RouteState Highway 66
CountyMohave County
StateArizona
Coordinates35.4741, -113.5855
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.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2022
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 rating99 US tons
Inventory rating99 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length32 ft (9.8 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 traffic1,643 (2017)
Projected traffic1,653 by 2037
Trucks15%
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

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 IRR SR 66 over Wash built?

It was built in 1935, making it 90 years old in 2025. It was reconstructed in 1962.

What condition is IRR SR 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 November 2022.

How much traffic does IRR SR 66 over Wash carry?

About 1,643 vehicles per day (2017 count), of which roughly 15% are trucks.

How long is IRR SR 66 over Wash?

The structure is 32 ft (9.8 m) long with a longest span of 10 ft (3 m).

Who owns IRR SR 66 over Wash?

It is owned by the State Highway Agency.