US Bridges

Shannon Road over Subdivision Drainageway

Good

Pima County, Arizona · 500 Ft of Orange Grove · Structure no. 08906

Built
1986
39 years old
Condition
Good
inspected November 2023
Type
Culvert
Steel
Length
21 ft
4 main spans
Daily traffic
20
2023 count
Owner
County
County Highway Agency

About this bridge

Shannon Road over Subdivision Drainageway is a steel culvert carrying Shannon Road over Subdivision Drainageway in Pima County, Arizona. It was built in 1986, so it is 39 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 20 vehicles a day, projected to reach 30 by 2042. The structure is 21 ft (6.4 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesShannon Road
CrossesSubdivision Drainageway
Location500 Ft of Orange Grove
RouteCounty Highway 0
CountyPima County
StateArizona
Coordinates32.32182, -111.02866
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 geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110.1 US tons
Inventory rating99 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans4
Design loadHS 20
Structure length21 ft (6.4 m)
Longest span6 ft (1.8 m)
Deck width43 ft (13.1 m)
Roadway width42 ft (12.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2023)
Projected traffic30 by 2042
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 Subdivision Drainageway built?

It was built in 1986, making it 39 years old in 2025.

What condition is Shannon Road over Subdivision Drainageway 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 Subdivision Drainageway carry?

About 20 vehicles per day (2023 count).

How long is Shannon Road over Subdivision Drainageway?

The structure is 21 ft (6.4 m) long with a longest span of 6 ft (1.8 m) and a deck 43 ft wide.

Who owns Shannon Road over Subdivision Drainageway?

It is owned by the County Highway Agency.