US Bridges

Northern Avenue over Dry Wash

Good

Maricopa County, Arizona · W of 12th ST · Structure no. 09703

Built
1977
48 years old
Condition
Good
inspected October 2021
Type
Culvert
Concrete Continuous
Length
64 ft
3 main spans
Daily traffic
41,200
2005 count
Owner
City
City or Municipal Highway Agency

About this bridge

Northern Avenue over Dry Wash is a concrete continuous culvert carrying Northern Avenue over Dry Wash in Maricopa County, Arizona. It was built in 1977, so it is 48 years old, older than the Arizona average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 41,200 vehicles a day, roughly 1% of them trucks, projected to reach 46,700 by 2030. The structure is 64 ft (19.6 m) long and 160 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesNorthern Avenue
CrossesDry Wash
LocationW of 12th ST
RouteCity Street 0
StateArizona
Coordinates33.5529, -112.0582
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionOctober 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82.8 US tons
Inventory rating50.4 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length64 ft (19.6 m)
Longest span20 ft (6.1 m)
Deck width160 ft (48.8 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic41,200 (2005)
Projected traffic46,700 by 2030
Trucks1%
Lanes on structure5
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 Northern Avenue over Dry Wash built?

It was built in 1977, making it 48 years old in 2025.

What condition is Northern Avenue over Dry Wash in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2021.

How much traffic does Northern Avenue over Dry Wash carry?

About 41,200 vehicles per day (2005 count), of which roughly 1% are trucks.

How long is Northern Avenue over Dry Wash?

The structure is 64 ft (19.6 m) long with a longest span of 20 ft (6.1 m) and a deck 160 ft wide.

Who owns Northern Avenue over Dry Wash?

It is owned by the City or Municipal Highway Agency.