US Bridges

IRR SR 286; FAS 31 over Altar Wash

Fair

Pima County, Arizona · 18.4 MI S JCT SR 86 · Structure no. 01574

Built
1972
53 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
231 ft
3 main spans
Daily traffic
373
2023 count
Owner
State
State Highway Agency

About this bridge

IRR SR 286; FAS 31 over Altar Wash is a prestressed concrete continuous stringer/multi-beam or girder carrying IRR SR 286; FAS 31 over Altar Wash in Pima County, Arizona. It was built in 1972, so it is 53 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 373 vehicles a day, roughly 20% of them trucks, projected to reach 383 by 2042. The structure is 231 ft (70.4 m) long and 41 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesIRR SR 286; FAS 31
CrossesAltar Wash
Location18.4 MI S JCT SR 86
RouteState Highway 286
CountyPima County
StateArizona
Coordinates31.8387, -111.4049
Functional classRural Major 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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 rating98 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 length231 ft (70.4 m)
Longest span77 ft (23.5 m)
Deck width41 ft (12.4 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic373 (2023)
Projected traffic383 by 2042
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 IRR SR 286; FAS 31 over Altar Wash built?

It was built in 1972, making it 53 years old in 2025.

What condition is IRR SR 286; FAS 31 over Altar 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 January 2024.

How much traffic does IRR SR 286; FAS 31 over Altar Wash carry?

About 373 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is IRR SR 286; FAS 31 over Altar Wash?

The structure is 231 ft (70.4 m) long with a longest span of 77 ft (23.5 m) and a deck 41 ft wide.

Who owns IRR SR 286; FAS 31 over Altar Wash?

It is owned by the State Highway Agency.