US Bridges

I 10; EB & WB over Four Mile Wash

Fair

Maricopa County, Arizona · 17.8 MI West of JCT SR 85 · Structure no. 06455

Built
1970
55 years old
Condition
Fair
inspected June 2021
Type
Culvert
Concrete Continuous
Length
43 ft
4 main spans
Daily traffic
27,485
2019 count
Owner
State
State Highway Agency

About this bridge

I 10; EB & WB over Four Mile Wash is a concrete continuous culvert carrying I 10; EB & WB over Four Mile Wash in Maricopa County, Arizona. It was built in 1970, so it is 55 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 27,485 vehicles a day, roughly 35% of them trucks, projected to reach 27,495 by 2039. The structure is 43 ft (13.1 m) long. If it were closed, the detour would be 29.8 mi (48 km).

Location

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CarriesI 10; EB & WB
CrossesFour Mile Wash
Location17.8 MI West of JCT SR 85
RouteInterstate 10
CountyMaricopa County
StateArizona
Coordinates33.48215, -112.86866
Functional classRural Principal Arterial - Interstate

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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2021
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 rating79 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 traffic27,485 (2019)
Projected traffic27,495 by 2039
Trucks35%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.8 mi (48 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I 10; EB & WB over Four Mile Wash built?

It was built in 1970, making it 55 years old in 2025.

What condition is I 10; EB & WB over Four Mile 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 2021.

How much traffic does I 10; EB & WB over Four Mile Wash carry?

About 27,485 vehicles per day (2019 count), of which roughly 35% are trucks.

How long is I 10; EB & WB over Four Mile Wash?

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

Who owns I 10; EB & WB over Four Mile Wash?

It is owned by the State Highway Agency.