US Bridges

Shannon Road over Carmack Wash

Good

Pima County, Arizona · 900 Ft N or Grove RD · Structure no. 08469

Built
1978
47 years old
Condition
Good
inspected November 2023
Type
Culvert
Concrete Continuous
Length
46 ft
3 main spans
Daily traffic
10,447
2023 count
Owner
County
County Highway Agency

About this bridge

Shannon Road over Carmack Wash is a concrete continuous culvert carrying Shannon Road over Carmack Wash in Pima County, Arizona. It was built in 1978, so it is 47 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 10,447 vehicles a day, projected to reach 10,457 by 2032. The structure is 46 ft (14 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesShannon Road
CrossesCarmack Wash
Location900 Ft N or Grove RD
RouteCounty Highway 0
CountyPima County
StateArizona
Coordinates32.32568, -111.02894
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 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length46 ft (14 m)
Longest span10 ft (3 m)
Deck width44 ft (13.5 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,447 (2023)
Projected traffic10,457 by 2032
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Shannon Road over Carmack Wash built?

It was built in 1978, making it 47 years old in 2025.

What condition is Shannon Road over Carmack 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 Shannon Road over Carmack Wash carry?

About 10,447 vehicles per day (2023 count).

How long is Shannon Road over Carmack Wash?

The structure is 46 ft (14 m) long with a longest span of 10 ft (3 m) and a deck 44 ft wide.

Who owns Shannon Road over Carmack Wash?

It is owned by the County Highway Agency.