US Bridges

Arivaca Road over Small Wash

Fair

Pima County, Arizona · 12.5 MI SW of I 19 · Structure no. 09724

Built
1981
44 years old
Condition
Fair
inspected November 2023
Type
Culvert
Concrete Continuous
Length
32 ft
4 main spans
Daily traffic
1,200
2021 count
Owner
County
County Highway Agency

About this bridge

Arivaca Road over Small Wash is a concrete continuous culvert carrying Arivaca Road over Small Wash in Pima County, Arizona. It was built in 1981, so it is 44 years old, younger 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 1,200 vehicles a day, roughly 10% of them trucks, projected to reach 1,210 by 2041. The structure is 32 ft (9.8 m) long. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesArivaca Road
CrossesSmall Wash
Location12.5 MI SW of I 19
RouteCounty Highway 631
CountyPima County
StateArizona
Coordinates31.66688, -111.24886
Functional classRural Major Collector

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 inspectionNovember 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110.1 US tons
Inventory rating98 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans4
Design loadHS 20
Structure length32 ft (9.8 m)
Longest span7 ft (2.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,200 (2021)
Projected traffic1,210 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 Arivaca Road over Small Wash built?

It was built in 1981, making it 44 years old in 2025.

What condition is Arivaca Road over Small 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 November 2023.

How much traffic does Arivaca Road over Small Wash carry?

About 1,200 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is Arivaca Road over Small Wash?

The structure is 32 ft (9.8 m) long with a longest span of 7 ft (2.1 m).

Who owns Arivaca Road over Small Wash?

It is owned by the County Highway Agency.