US Bridges

IRR US 70 over RR & IRR SR 170

Fair

Gila County, Arizona · JCT SR 170 · Structure no. 00477

Built
1957
68 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
205 ft
4 main spans
Daily traffic
6,193
2022 count
Owner
State
State Highway Agency

About this bridge

IRR US 70 over RR & IRR SR 170 is a steel continuous stringer/multi-beam or girder carrying IRR US 70 over RR & IRR SR 170 in Gila County, Arizona. It was built in 1957, so it is 68 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 6,193 vehicles a day, roughly 17% of them trucks, projected to reach 6,203 by 2042. The structure is 205 ft (62.5 m) long and 45 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesIRR US 70
CrossesRR & IRR SR 170
LocationJCT SR 170
RouteU.S. Route 70
CountyGila County
StateArizona
Coordinates33.298, -110.4575
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length205 ft (62.5 m)
Longest span55 ft (16.8 m)
Deck width45 ft (13.7 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deck25 ft (7.6 m)

Traffic and service

Average daily traffic6,193 (2022)
Projected traffic6,203 by 2042
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and railroad
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 US 70 over RR & IRR SR 170 built?

It was built in 1957, making it 68 years old in 2025.

What condition is IRR US 70 over RR & IRR SR 170 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 September 2023.

How much traffic does IRR US 70 over RR & IRR SR 170 carry?

About 6,193 vehicles per day (2022 count), of which roughly 17% are trucks.

How long is IRR US 70 over RR & IRR SR 170?

The structure is 205 ft (62.5 m) long with a longest span of 55 ft (16.8 m) and a deck 45 ft wide.

Who owns IRR US 70 over RR & IRR SR 170?

It is owned by the State Highway Agency.