US Bridges

Frontier ST over Wash

Fair

Pinal County, Arizona · 2.7 MI W JCT I-10 · Structure no. 11336

Built
1956
69 years old
Condition
Fair
inspected December 2023
Type
Culvert
Concrete Continuous
Length
24 ft
2 main spans
Daily traffic
2,710
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Frontier ST over Wash is a concrete continuous culvert carrying Frontier ST over Wash in Pinal County, Arizona. It was built in 1956, so it is 69 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 2,710 vehicles a day, roughly 5% of them trucks, projected to reach 2,720 by 2041. The structure is 24 ft (7.3 m) long and 88 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesFrontier ST
CrossesWash
Location2.7 MI W JCT I-10
RouteCity Street 0
CountyPinal County
StateArizona
Coordinates32.7464, -111.5461
Functional classRural 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 inspectionDecember 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 rating58 US tons
Inventory rating35.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length24 ft (7.3 m)
Longest span10 ft (3 m)
Deck width88 ft (26.8 m)
Roadway width86 ft (26.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,710 (2021)
Projected traffic2,720 by 2041
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 Frontier ST over Wash built?

It was built in 1956, making it 69 years old in 2025.

What condition is Frontier ST over 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 2023.

How much traffic does Frontier ST over Wash carry?

About 2,710 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is Frontier ST over Wash?

The structure is 24 ft (7.3 m) long with a longest span of 10 ft (3 m) and a deck 88 ft wide.

Who owns Frontier ST over Wash?

It is owned by the City or Municipal Highway Agency.