US Bridges

Silverbell Road over North Mountain Ave Wash

Good

Pima County, Arizona · 0.8 MI N of Grant Road · Structure no. 09980

Built
1987
38 years old, rebuilt 2015
Condition
Good
inspected August 2021
Type
Culvert
Concrete Continuous
Length
91 ft
6 main spans
Daily traffic
10,053
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Silverbell Road over North Mountain Ave Wash is a concrete continuous culvert carrying Silverbell Road over North Mountain Ave Wash in Pima County, Arizona. It was built in 1987 and reconstructed in 2015, so it is 38 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 10,053 vehicles a day, roughly 10% of them trucks, projected to reach 10,063 by 2040. The structure is 91 ft (27.7 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesSilverbell Road
CrossesNorth Mountain Ave Wash
Location0.8 MI N of Grant Road
RouteCity Street 0
CountyPima County
StateArizona
Coordinates32.2623, -111.0205
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 inspectionAugust 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating82 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans6
Design loadHS 20
Structure length91 ft (27.7 m)
Longest span14 ft (4.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,053 (2020)
Projected traffic10,063 by 2040
Trucks10%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Silverbell Road over North Mountain Ave Wash built?

It was built in 1987, making it 38 years old in 2025. It was reconstructed in 2015.

What condition is Silverbell Road over North Mountain Ave 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 August 2021.

How much traffic does Silverbell Road over North Mountain Ave Wash carry?

About 10,053 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Silverbell Road over North Mountain Ave Wash?

The structure is 91 ft (27.7 m) long with a longest span of 14 ft (4.3 m).

Who owns Silverbell Road over North Mountain Ave Wash?

It is owned by the City or Municipal Highway Agency.