US Bridges

IRR BIA RTE 161 over Wash

Poor

Pima County, Arizona · 2.7 KM South of Az HWY 86 · Structure no. 00000000000H661

Built
1998
27 years old
Condition
Poor
inspected January 2023
Type
Culvert
Aluminum, Wrought Iron, or Cast Iron
Length
39 ft
3 main spans
Daily traffic
250
2023 count
Owner
Federal
Bureau of Indian Affairs

About this bridge

IRR BIA RTE 161 over Wash is a aluminum, wrought iron, or cast iron culvert carrying IRR BIA RTE 161 over Wash in Pima County, Arizona. It was built in 1998, so it is 27 years old, younger than the Arizona average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: open, posting recommended but not legally implemented.

It carries about 250 vehicles a day, roughly 2% of them trucks, projected to reach 297 by 2043. The structure is 39 ft (11.9 m) long and 32 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesIRR BIA RTE 161
CrossesWash
Location2.7 KM South of Az HWY 86
RouteFederal Lands Road 161
CountyPima County
StateArizona
Coordinates31.90837, -111.77618
Functional classRural Minor Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, posting recommended but not legally implemented
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry6: Equal to present minimum criteria
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating7.4 US tons
Inventory rating5.4 US tons

Structure

Structure typeCulvert
MaterialAluminum, Wrought Iron, or Cast Iron
DeckNot applicable
Main spans3
Design loadHS 25 or greater
Structure length39 ft (11.9 m)
Longest span13 ft (3.9 m)
Deck width32 ft (9.7 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic250 (2023)
Projected traffic297 by 2043
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerBureau of Indian Affairs
Maintained byBureau of Indian Affairs
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$200,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was IRR BIA RTE 161 over Wash built?

It was built in 1998, making it 27 years old in 2025.

What condition is IRR BIA RTE 161 over Wash in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in January 2023.

How much traffic does IRR BIA RTE 161 over Wash carry?

About 250 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is IRR BIA RTE 161 over Wash?

The structure is 39 ft (11.9 m) long with a longest span of 13 ft (3.9 m) and a deck 32 ft wide.

Who owns IRR BIA RTE 161 over Wash?

It is owned by the Bureau of Indian Affairs.