US Bridges

12th ST over Dry Wash

Good

Maricopa County, Arizona · 100 N of Northern Ave · Structure no. 08523

Built
1964
61 years old, rebuilt 1980
Condition
Good
inspected November 2023
Type
Culvert
Concrete Continuous
Length
24 ft
2 main spans
Daily traffic
17,661
2016 count
Owner
City
City or Municipal Highway Agency

About this bridge

12th ST over Dry Wash is a concrete continuous culvert carrying 12th ST over Dry Wash in Maricopa County, Arizona. It was built in 1964 and reconstructed in 1980, so it is 61 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 17,661 vehicles a day, roughly 1% of them trucks, projected to reach 17,671 by 2039. The structure is 24 ft (7.3 m) long and 64 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries12th ST
CrossesDry Wash
Location100 N of Northern Ave
RouteCity Street 0
CountyMaricopa County
StateArizona
Coordinates33.5536, -112.0567
Functional classUrban Collector

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 inspectionNovember 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72 US tons
Inventory rating43.2 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length24 ft (7.3 m)
Longest span10 ft (3 m)
Deck width64 ft (19.5 m)
Roadway width54 ft (16.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,661 (2016)
Projected traffic17,671 by 2039
Trucks1%
Lanes on structure3
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 12th ST over Dry Wash built?

It was built in 1964, making it 61 years old in 2025. It was reconstructed in 1980.

What condition is 12th ST 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 November 2023.

How much traffic does 12th ST over Dry Wash carry?

About 17,661 vehicles per day (2016 count), of which roughly 1% are trucks.

How long is 12th ST over Dry Wash?

The structure is 24 ft (7.3 m) long with a longest span of 10 ft (3 m) and a deck 64 ft wide.

Who owns 12th ST over Dry Wash?

It is owned by the City or Municipal Highway Agency.