US Bridges

Porter Road over Drainage Channel

Good

Pinal County, Arizona · 0.1 MI N JCT Mcg HWY · Structure no. 10820

Built
2008
17 years old
Condition
Good
inspected April 2021
Type
Culvert
Concrete Continuous
Length
25 ft
2 main spans
Daily traffic
1,400
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Porter Road over Drainage Channel is a concrete continuous culvert carrying Porter Road over Drainage Channel in Pinal County, Arizona. It was built in 2008, so it is 17 years old, younger 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 1,400 vehicles a day, roughly 3% of them trucks, projected to reach 1,410 by 2040. The structure is 25 ft (7.6 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesPorter Road
CrossesDrainage Channel
Location0.1 MI N JCT Mcg HWY
RouteCity Street 0
CountyPinal County
StateArizona
Coordinates33.0359, -112.0134
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 protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionApril 2021
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 spans2
Design loadHS 20
Structure length25 ft (7.6 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,400 (2020)
Projected traffic1,410 by 2040
Trucks3%
Lanes on structure5
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 Porter Road over Drainage Channel built?

It was built in 2008, making it 17 years old in 2025.

What condition is Porter 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 April 2021.

How much traffic does Porter Road over Drainage Channel carry?

About 1,400 vehicles per day (2020 count), of which roughly 3% are trucks.

How long is Porter Road over Drainage Channel?

The structure is 25 ft (7.6 m) long with a longest span of 12 ft (3.7 m).

Who owns Porter Road over Drainage Channel?

It is owned by the City or Municipal Highway Agency.