US Bridges

IRR US 70 over Gilson Wash

Fair

Gila County, Arizona · 7.7 MI E JCT US 60 · Structure no. 00464

Built
1953
72 years old
Condition
Fair
inspected October 2024
Type
Slab
Concrete Continuous
Length
219 ft
9 main spans
Daily traffic
6,619
2024 count
Owner
State
State Highway Agency

About this bridge

IRR US 70 over Gilson Wash is a concrete continuous slab carrying IRR US 70 over Gilson Wash in Gila County, Arizona. It was built in 1953, so it is 72 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 6,619 vehicles a day, roughly 15% of them trucks, projected to reach 6,629 by 2042. The structure is 219 ft (66.8 m) long and 35 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesIRR US 70
CrossesGilson Wash
Location7.7 MI E JCT US 60
RouteU.S. Route 70
CountyGila County
StateArizona
Coordinates33.35185, -110.6493
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41 US tons
Inventory rating25 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans9
Design loadHS 20
Structure length219 ft (66.8 m)
Longest span25 ft (7.6 m)
Deck width35 ft (10.6 m)
Roadway width32 ft (9.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,619 (2024)
Projected traffic6,629 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was IRR US 70 over Gilson Wash built?

It was built in 1953, making it 72 years old in 2025.

What condition is IRR US 70 over Gilson 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 October 2024.

How much traffic does IRR US 70 over Gilson Wash carry?

About 6,619 vehicles per day (2024 count), of which roughly 15% are trucks.

How long is IRR US 70 over Gilson Wash?

The structure is 219 ft (66.8 m) long with a longest span of 25 ft (7.6 m) and a deck 35 ft wide.

Who owns IRR US 70 over Gilson Wash?

It is owned by the State Highway Agency.