US Bridges

IRR SR 66 over Hackberry Wash

Fair

Mohave County, Arizona · 23.5 MI E JCT I-40 · Structure no. 00738

Built
1962
63 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
351 ft
4 main spans
Daily traffic
1,996
2021 count
Owner
State
State Highway Agency

About this bridge

IRR SR 66 over Hackberry Wash is a steel continuous stringer/multi-beam or girder carrying IRR SR 66 over Hackberry Wash in Mohave County, Arizona. It was built in 1962, so it is 63 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 1,996 vehicles a day, roughly 15% of them trucks, projected to reach 2,006 by 2041. The structure is 351 ft (107 m) long and 35 ft wide. If it were closed, the detour would be 19.3 mi (31 km).

Location

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CarriesIRR SR 66
CrossesHackberry Wash
Location23.5 MI E JCT I-40
RouteState Highway 66
CountyMohave County
StateArizona
Coordinates35.3793, -113.7278
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length351 ft (107 m)
Longest span96 ft (29.3 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,996 (2021)
Projected traffic2,006 by 2041
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 Hackberry Wash built?

It was built in 1962, making it 63 years old in 2025.

What condition is IRR SR 66 over Hackberry 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 Hackberry Wash carry?

About 1,996 vehicles per day (2021 count), of which roughly 15% are trucks.

How long is IRR SR 66 over Hackberry Wash?

The structure is 351 ft (107 m) long with a longest span of 96 ft (29.3 m) and a deck 35 ft wide.

Who owns IRR SR 66 over Hackberry Wash?

It is owned by the State Highway Agency.