US Bridges

ST Marys RD over Santa Cruz River

Fair

Pima County, Arizona · ST Marys RD W of I 10 · Structure no. 09005

Built
1950
75 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
225 ft
4 main spans
Daily traffic
15,769
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

ST Marys RD over Santa Cruz River is a steel continuous stringer/multi-beam or girder carrying ST Marys RD over Santa Cruz River in Pima County, Arizona. It was built in 1950, so it is 75 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 5 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 15,769 vehicles a day, roughly 10% of them trucks, projected to reach 15,779 by 2042. The structure is 225 ft (68.6 m) long and 64 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesST Marys RD
CrossesSanta Cruz River
LocationST Marys RD W of I 10
RouteCity Street 0
CountyPima County
StateArizona
Coordinates32.2296, -110.985
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42 US tons
Inventory rating25 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length225 ft (68.6 m)
Longest span60 ft (18.3 m)
Deck width64 ft (19.4 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,769 (2022)
Projected traffic15,779 by 2042
Trucks10%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was ST Marys RD over Santa Cruz River built?

It was built in 1950, making it 75 years old in 2025.

What condition is ST Marys RD over Santa Cruz River 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 August 2023.

How much traffic does ST Marys RD over Santa Cruz River carry?

About 15,769 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is ST Marys RD over Santa Cruz River?

The structure is 225 ft (68.6 m) long with a longest span of 60 ft (18.3 m) and a deck 64 ft wide.

Who owns ST Marys RD over Santa Cruz River?

It is owned by the City or Municipal Highway Agency.