US Bridges

IRR SR 66 over Wash

Fair

Mohave County, Arizona · 31.3 MI E JCT I-40 · Structure no. 00192

Built
1937
88 years old, rebuilt 1964
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
115 ft
3 main spans
Daily traffic
1,364
2022 count
Owner
State
State Highway Agency

About this bridge

IRR SR 66 over Wash is a steel continuous stringer/multi-beam or girder carrying IRR SR 66 over Wash in Mohave County, Arizona. It was built in 1937 and reconstructed in 1964, so it is 88 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 1,364 vehicles a day, roughly 14% of them trucks, projected to reach 1,374 by 2042. The structure is 115 ft (35.1 m) long and 45 ft wide. If it were closed, the detour would be 19.3 mi (31 km).

Location

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CarriesIRR SR 66
CrossesWash
Location31.3 MI E JCT I-40
RouteState Highway 66
CountyMohave County
StateArizona
Coordinates35.4224, -113.6488
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length115 ft (35.1 m)
Longest span44 ft (13.4 m)
Deck width45 ft (13.8 m)
Roadway width42 ft (12.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,364 (2022)
Projected traffic1,374 by 2042
Trucks14%
Lanes on structure3
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 1937, making it 88 years old in 2025. It was reconstructed in 1964.

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 2024.

How much traffic does IRR SR 66 over Wash carry?

About 1,364 vehicles per day (2022 count), of which roughly 14% are trucks.

How long is IRR SR 66 over Wash?

The structure is 115 ft (35.1 m) long with a longest span of 44 ft (13.4 m) and a deck 45 ft wide.

Who owns IRR SR 66 over Wash?

It is owned by the State Highway Agency.