US Bridges

IRR Seed Farm Road over I-10

Fair

Pinal County, Arizona · 5.9 MI NW JCT SR 187 · Structure no. 01216

Built
1967
58 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
292 ft
4 main spans
Daily traffic
50
2022 count
Owner
State
State Highway Agency

About this bridge

IRR Seed Farm Road over I-10 is a steel continuous stringer/multi-beam or girder carrying IRR Seed Farm Road over I-10 in Pinal County, Arizona. It was built in 1967, so it is 58 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.

It carries about 50 vehicles a day, roughly 5% of them trucks, projected to reach 60 by 2042. The structure is 292 ft (89 m) long and 31 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesIRR Seed Farm Road
CrossesI-10
Location5.9 MI NW JCT SR 187
RouteCounty Highway 0
CountyPinal County
StateArizona
Coordinates33.0742, -111.8088
Functional classRural Local

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating59 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length292 ft (89 m)
Longest span93 ft (28.3 m)
Deck width31 ft (9.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deck35 ft (10.7 m)

Traffic and service

Average daily traffic50 (2022)
Projected traffic60 by 2042
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed6.2 mi (10 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was IRR Seed Farm Road over I-10 built?

It was built in 1967, making it 58 years old in 2025.

What condition is IRR Seed Farm Road over I-10 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 August 2024.

How much traffic does IRR Seed Farm Road over I-10 carry?

About 50 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is IRR Seed Farm Road over I-10?

The structure is 292 ft (89 m) long with a longest span of 93 ft (28.3 m) and a deck 31 ft wide.

Who owns IRR Seed Farm Road over I-10?

It is owned by the State Highway Agency.