US Bridges

Grant Road over Silvercroft Wash

Fair

Pima County, Arizona · 0.4 MI E Silverbell RD · Structure no. 09018

Built
1959
66 years old, rebuilt 1978
Condition
Fair
inspected July 2023
Type
Culvert
Concrete Continuous
Length
123 ft
8 main spans
Daily traffic
31,149
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Grant Road over Silvercroft Wash is a concrete continuous culvert carrying Grant Road over Silvercroft Wash in Pima County, Arizona. It was built in 1959 and reconstructed in 1978, so it is 66 years old, older than the Arizona average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 31,149 vehicles a day, roughly 10% of them trucks, projected to reach 31,159 by 2042. The structure is 123 ft (37.5 m) long and 102 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesGrant Road
CrossesSilvercroft Wash
Location0.4 MI E Silverbell RD
RouteCity Street 0
CountyPima County
StateArizona
Coordinates32.2506, -111.0062
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55 US tons
Inventory rating33 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans8
Design loadHS 20
Structure length123 ft (37.5 m)
Longest span10 ft (3 m)
Deck width102 ft (31.1 m)
Roadway width77 ft (23.5 m)
Vertical clearance over deck19 ft (5.6 m)

Traffic and service

Average daily traffic31,149 (2023)
Projected traffic31,159 by 2042
Trucks10%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 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 Grant Road over Silvercroft Wash built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1978.

What condition is Grant Road over Silvercroft Wash in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in July 2023.

How much traffic does Grant Road over Silvercroft Wash carry?

About 31,149 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Grant Road over Silvercroft Wash?

The structure is 123 ft (37.5 m) long with a longest span of 10 ft (3 m) and a deck 102 ft wide.

Who owns Grant Road over Silvercroft Wash?

It is owned by the City or Municipal Highway Agency.