US Bridges

IRR Mission RD over Mine Haul Road

FairPosted for load

Pima County, Arizona · 1.5 MI N Pima Mine Road · Structure no. 08318

Built
1973
52 years old
Condition
Fair
inspected December 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
240 ft
4 main spans
Daily traffic
852
2022 count
Owner
County
County Highway Agency

About this bridge

IRR Mission RD over Mine Haul Road is a prestressed concrete box beam or girders - multiple carrying IRR Mission RD over Mine Haul Road in Pima County, Arizona. It was built in 1973, so it is 52 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 852 vehicles a day, roughly 5% of them trucks, projected to reach 862 by 2042. The structure is 240 ft (73.2 m) long and 45 ft wide. If it were closed, the detour would be 29.8 mi (48 km).

Location

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CarriesIRR Mission RD
CrossesMine Haul Road
Location1.5 MI N Pima Mine Road
RouteCounty Highway 0
CountyPima County
StateArizona
Coordinates32.0179, -111.0748
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating56 US tons
Inventory rating27 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans4
Design loadHS 20
Structure length240 ft (73.2 m)
Longest span60 ft (18.3 m)
Deck width45 ft (13.6 m)
Roadway width41 ft (12.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic852 (2022)
Projected traffic862 by 2042
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed29.8 mi (48 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2,000 (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was IRR Mission RD over Mine Haul Road built?

It was built in 1973, making it 52 years old in 2025.

What condition is IRR Mission RD over Mine Haul Road 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 IRR Mission RD over Mine Haul Road carry?

About 852 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is IRR Mission RD over Mine Haul Road?

The structure is 240 ft (73.2 m) long with a longest span of 60 ft (18.3 m) and a deck 45 ft wide.

Who owns IRR Mission RD over Mine Haul Road?

It is owned by the County Highway Agency.