US Bridges

N Flowing Wells RD over Rillito River

Fair

Pima County, Arizona · At Rillito River · Structure no. 09339

Built
1971
54 years old
Condition
Fair
inspected January 2025
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
483 ft
8 main spans
Daily traffic
22,976
2025 count
Owner
County
County Highway Agency

About this bridge

N Flowing Wells RD over Rillito River is a prestressed concrete box beam or girders - multiple carrying N Flowing Wells RD over Rillito River in Pima County, Arizona. It was built in 1971, so it is 54 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 22,976 vehicles a day, roughly 5% of them trucks, projected to reach 22,986 by 2042. The structure is 483 ft (147.2 m) long and 76 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesN Flowing Wells RD
CrossesRillito River
LocationAt Rillito River
RouteCounty Highway 0
StateArizona
Coordinates32.2937, -110.9951
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating58 US tons
Inventory rating35.1 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans8
Design loadHS 20
Structure length483 ft (147.2 m)
Longest span60 ft (18.3 m)
Deck width76 ft (23.2 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,976 (2025)
Projected traffic22,986 by 2042
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.7 mi (6 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 N Flowing Wells RD over Rillito River built?

It was built in 1971, making it 54 years old in 2025.

What condition is N Flowing Wells RD 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 January 2025.

How much traffic does N Flowing Wells RD over Rillito River carry?

About 22,976 vehicles per day (2025 count), of which roughly 5% are trucks.

How long is N Flowing Wells RD over Rillito River?

The structure is 483 ft (147.2 m) long with a longest span of 60 ft (18.3 m) and a deck 76 ft wide.

Who owns N Flowing Wells RD over Rillito River?

It is owned by the County Highway Agency.