US Bridges

29th Avenue over Dry Wash

Fair

Maricopa County, Arizona · North of Marconi Ave · Structure no. 08765

Built
1979
46 years old
Condition
Fair
inspected November 2020
Type
Culvert
Concrete Continuous
Length
44 ft
4 main spans
Daily traffic
9,000
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

29th Avenue over Dry Wash is a concrete continuous culvert carrying 29th Avenue over Dry Wash in Maricopa County, Arizona. It was built in 1979, so it is 46 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 9,000 vehicles a day, roughly 1% of them trucks, projected to reach 9,010 by 2040. The structure is 44 ft (13.4 m) long and 65 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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Carries29th Avenue
CrossesDry Wash
LocationNorth of Marconi Ave
RouteCity Street 0
CountyMaricopa County
StateArizona
Coordinates33.6327, -112.1205
Functional classUrban 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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2020
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable 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
DeckNot applicable
Main spans4
Design loadHS 20
Structure length44 ft (13.4 m)
Longest span10 ft (3 m)
Deck width65 ft (19.8 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,000 (2020)
Projected traffic9,010 by 2040
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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 29th Avenue over Dry Wash built?

It was built in 1979, making it 46 years old in 2025.

What condition is 29th Avenue 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 November 2020.

How much traffic does 29th Avenue over Dry Wash carry?

About 9,000 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is 29th Avenue over Dry Wash?

The structure is 44 ft (13.4 m) long with a longest span of 10 ft (3 m) and a deck 65 ft wide.

Who owns 29th Avenue over Dry Wash?

It is owned by the City or Municipal Highway Agency.