US Bridges

Swan Road over Rillito River

Fair

Pima County, Arizona · 0.25 MI S of River RD · Structure no. 09930

Built
1985
40 years old, rebuilt 1998
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
483 ft
5 main spans
Daily traffic
24,280
2022 count
Owner
County
County Highway Agency

About this bridge

Swan Road over Rillito River is a prestressed concrete stringer/multi-beam or girder carrying Swan Road over Rillito River in Pima County, Arizona. It was built in 1985 and reconstructed in 1998, so it is 40 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 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 24,280 vehicles a day, projected to reach 24,290 by 2042. The structure is 483 ft (147.2 m) long and 107 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesSwan Road
CrossesRillito River
Location0.25 MI S of River RD
RouteCounty Highway 0
CountyPima County
StateArizona
Coordinates32.27167, -110.89251
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating48 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length483 ft (147.2 m)
Longest span97 ft (29.6 m)
Deck width107 ft (32.6 m)
Roadway width92 ft (28 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,280 (2022)
Projected traffic24,290 by 2042
Trucks0%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemYes

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 Swan Road over Rillito River built?

It was built in 1985, making it 40 years old in 2025. It was reconstructed in 1998.

What condition is Swan Road over Rillito 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 December 2024.

How much traffic does Swan Road over Rillito River carry?

About 24,280 vehicles per day (2022 count).

How long is Swan Road over Rillito River?

The structure is 483 ft (147.2 m) long with a longest span of 97 ft (29.6 m) and a deck 107 ft wide.

Who owns Swan Road over Rillito River?

It is owned by the County Highway Agency.