US Bridges

Dobson Road over Drainage Channel

Good

Maricopa County, Arizona · 0.1 MI N US 60 · Structure no. 06642

Built
1977
48 years old
Condition
Good
inspected January 2022
Type
Culvert
Concrete Continuous
Length
32 ft
3 main spans
Daily traffic
34,500
2016 count
Owner
State
State Highway Agency

About this bridge

Dobson Road over Drainage Channel is a concrete continuous culvert carrying Dobson Road over Drainage Channel 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 34,500 vehicles a day, roughly 3% of them trucks, projected to reach 34,510 by 2036. The structure is 32 ft (9.8 m) long. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesDobson Road
CrossesDrainage Channel
Location0.1 MI N US 60
RouteU.S. Route 60
CountyMaricopa County
StateArizona
Coordinates33.3858, -111.8747
Functional classUrban Minor 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 protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionJanuary 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating99 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length32 ft (9.8 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deck18 ft (5.5 m)

Traffic and service

Average daily traffic34,500 (2016)
Projected traffic34,510 by 2036
Trucks3%
Lanes on structure9
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes

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
NavigationNo navigation control on waterway

Frequently asked questions

When was Dobson Road over Drainage Channel built?

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

What condition is Dobson Road over Drainage Channel 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 January 2022.

How much traffic does Dobson Road over Drainage Channel carry?

About 34,500 vehicles per day (2016 count), of which roughly 3% are trucks.

How long is Dobson Road over Drainage Channel?

The structure is 32 ft (9.8 m) long with a longest span of 10 ft (3 m).

Who owns Dobson Road over Drainage Channel?

It is owned by the State Highway Agency.