US Bridges

Knox Road over Dry Wash

Fair

Maricopa County, Arizona · At Warpaint Drive · Structure no. 07743

Built
1985
40 years old
Condition
Fair
inspected January 2025
Type
Culvert
Concrete Continuous
Length
53 ft
5 main spans
Daily traffic
1,050
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

Knox Road over Dry Wash is a concrete continuous culvert carrying Knox Road over Dry Wash in Maricopa County, Arizona. It was built in 1985, so it is 40 years old, younger 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 1,050 vehicles a day, roughly 1% of them trucks, projected to reach 1,060 by 2042. The structure is 53 ft (16.2 m) long and 62 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesKnox Road
CrossesDry Wash
LocationAt Warpaint Drive
RouteCity Street 0
CountyMaricopa County
StateArizona
Coordinates33.3248, -112.011
Functional classUrban Local

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 protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86.4 US tons
Inventory rating50.4 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length53 ft (16.2 m)
Longest span10 ft (3 m)
Deck width62 ft (18.9 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,050 (2024)
Projected traffic1,060 by 2042
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Knox Road over Dry Wash built?

It was built in 1985, making it 40 years old in 2025.

What condition is Knox Road over Dry 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 January 2025.

How much traffic does Knox Road over Dry Wash carry?

About 1,050 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is Knox Road over Dry Wash?

The structure is 53 ft (16.2 m) long with a longest span of 10 ft (3 m) and a deck 62 ft wide.

Who owns Knox Road over Dry Wash?

It is owned by the City or Municipal Highway Agency.