US Bridges

Willow Ranch Road over I-40; Lookout Wash

Fair

Mohave County, Arizona · 15.5 MI E JCT US 93 · Structure no. 01770

Built
1976
49 years old
Condition
Fair
inspected June 2024
Type
Box Beam or Girders - Single or Spread
Concrete Continuous
Length
471 ft
4 main spans
Daily traffic
100
2022 count
Owner
State
State Highway Agency

About this bridge

Willow Ranch Road over I-40; Lookout Wash is a concrete continuous box beam or girders - single or spread carrying Willow Ranch Road over I-40; Lookout Wash in Mohave County, Arizona. It was built in 1976, so it is 49 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 5 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 100 vehicles a day, projected to reach 110 by 2042. The structure is 471 ft (143.6 m) long and 31 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

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CarriesWillow Ranch Road
CrossesI-40; Lookout Wash
Location15.5 MI E JCT US 93
RouteCounty Highway 0
CountyMohave County
StateArizona
Coordinates35.1901, -113.4351
Functional classRural Minor 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating56 US tons
Inventory rating31 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length471 ft (143.6 m)
Longest span132 ft (40.2 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2022)
Projected traffic110 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed19.9 mi (32 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 Willow Ranch Road over I-40; Lookout Wash built?

It was built in 1976, making it 49 years old in 2025.

What condition is Willow Ranch Road over I-40; Lookout 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 June 2024.

How much traffic does Willow Ranch Road over I-40; Lookout Wash carry?

About 100 vehicles per day (2022 count).

How long is Willow Ranch Road over I-40; Lookout Wash?

The structure is 471 ft (143.6 m) long with a longest span of 132 ft (40.2 m) and a deck 31 ft wide.

Who owns Willow Ranch Road over I-40; Lookout Wash?

It is owned by the State Highway Agency.