US Bridges

IRR BIA RTE 16 over Ak Chin Wash

Fair

Pinal County, Arizona · 6.7 KM S of Maricopa · Structure no. 00000000000H150

Built
1972
53 years old
Condition
Fair
inspected January 2023
Type
Culvert
Concrete Continuous
Length
33 ft
3 main spans
Daily traffic
400
2023 count
Owner
Federal
Bureau of Indian Affairs

About this bridge

IRR BIA RTE 16 over Ak Chin Wash is a concrete continuous culvert carrying IRR BIA RTE 16 over Ak Chin Wash in Pinal 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 400 vehicles a day, roughly 4% of them trucks, projected to reach 500 by 2043. The structure is 33 ft (10.1 m) long and 41 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesIRR BIA RTE 16
CrossesAk Chin Wash
Location6.7 KM S of Maricopa
RouteFederal Lands Road 16
CountyPinal County
StateArizona
Coordinates33.00011, -112.03064
Functional classRural Minor 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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2023
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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.1 US tons
Inventory rating35.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length33 ft (10.1 m)
Longest span10 ft (3.1 m)
Deck width41 ft (12.4 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic400 (2023)
Projected traffic500 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was IRR BIA RTE 16 over Ak Chin Wash built?

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

What condition is IRR BIA RTE 16 over Ak Chin 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 2023.

How much traffic does IRR BIA RTE 16 over Ak Chin Wash carry?

About 400 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is IRR BIA RTE 16 over Ak Chin Wash?

The structure is 33 ft (10.1 m) long with a longest span of 10 ft (3.1 m) and a deck 41 ft wide.

Who owns IRR BIA RTE 16 over Ak Chin Wash?

It is owned by the Bureau of Indian Affairs.