US Bridges

Mission Road over Wash @ Silverlake

Good

Pima County, Arizona · Mission & Silverlake · Structure no. 09350

Built
1974
51 years old, rebuilt 1986
Condition
Good
inspected May 2021
Type
Culvert
Concrete Continuous
Length
39 ft
3 main spans
Daily traffic
15,001
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Mission Road over Wash @ Silverlake is a concrete continuous culvert carrying Mission Road over Wash @ Silverlake in Pima County, Arizona. It was built in 1974 and reconstructed in 1986, so it is 51 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 15,001 vehicles a day, roughly 5% of them trucks, projected to reach 15,011 by 2040. The structure is 39 ft (11.9 m) long and 124 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesMission Road
CrossesWash @ Silverlake
LocationMission & Silverlake
RouteCity Street 0
CountyPima County
StateArizona
Coordinates32.2001, -110.9966
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 inspectionMay 2021
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 adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating58 US tons
Inventory rating35.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length39 ft (11.9 m)
Longest span12 ft (3.7 m)
Deck width124 ft (37.8 m)
Roadway width90 ft (27.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,001 (2020)
Projected traffic15,011 by 2040
Trucks5%
Lanes on structure7
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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 Mission Road over Wash @ Silverlake built?

It was built in 1974, making it 51 years old in 2025. It was reconstructed in 1986.

What condition is Mission Road over Wash @ Silverlake 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 May 2021.

How much traffic does Mission Road over Wash @ Silverlake carry?

About 15,001 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Mission Road over Wash @ Silverlake?

The structure is 39 ft (11.9 m) long with a longest span of 12 ft (3.7 m) and a deck 124 ft wide.

Who owns Mission Road over Wash @ Silverlake?

It is owned by the City or Municipal Highway Agency.