US Bridges

Colossal Cave Road over Pantano Wash

Fair

Pima County, Arizona · 2.2 MI N of I 10 · Structure no. 07575

Built
1988
37 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
383 ft
3 main spans
Daily traffic
9,096
2022 count
Owner
County
County Highway Agency

About this bridge

Colossal Cave Road over Pantano Wash is a prestressed concrete continuous stringer/multi-beam or girder carrying Colossal Cave Road over Pantano Wash in Pima County, Arizona. It was built in 1988, so it is 37 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 9,096 vehicles a day, roughly 5% of them trucks, projected to reach 10,006 by 2042. The structure is 383 ft (116.7 m) long and 47 ft wide.

Location

Open in Google Maps
CarriesColossal Cave Road
CrossesPantano Wash
Location2.2 MI N of I 10
RouteCounty Highway 0
CountyPima County
StateArizona
Coordinates32.04985, -110.69757
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating91.1 US tons
Inventory rating44 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length383 ft (116.7 m)
Longest span125 ft (38.1 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,096 (2022)
Projected traffic10,006 by 2042
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 Colossal Cave Road over Pantano Wash built?

It was built in 1988, making it 37 years old in 2025.

What condition is Colossal Cave Road over Pantano 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 December 2024.

How much traffic does Colossal Cave Road over Pantano Wash carry?

About 9,096 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is Colossal Cave Road over Pantano Wash?

The structure is 383 ft (116.7 m) long with a longest span of 125 ft (38.1 m) and a deck 47 ft wide.

Who owns Colossal Cave Road over Pantano Wash?

It is owned by the County Highway Agency.