US Bridges

IRR US 70 over Wash

Good

Graham County, Arizona · 17.2 MI E SR 170 · Structure no. 04292

Built
1956
69 years old
Condition
Good
inspected November 2023
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
2,940
2022 count
Owner
State
State Highway Agency

About this bridge

IRR US 70 over Wash is a concrete continuous culvert carrying IRR US 70 over Wash in Graham County, Arizona. It was built in 1956, so it is 69 years old, older than the Arizona average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,940 vehicles a day, roughly 25% of them trucks, projected to reach 2,950 by 2042. The structure is 21 ft (6.4 m) long and 110 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesIRR US 70
CrossesWash
Location17.2 MI E SR 170
RouteU.S. Route 70
CountyGraham County
StateArizona
Coordinates33.20319, -110.19314
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating97 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width110 ft (33.5 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,940 (2022)
Projected traffic2,950 by 2042
Trucks25%
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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$1,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was IRR US 70 over Wash built?

It was built in 1956, making it 69 years old in 2025.

What condition is IRR US 70 over Wash in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2023.

How much traffic does IRR US 70 over Wash carry?

About 2,940 vehicles per day (2022 count), of which roughly 25% are trucks.

How long is IRR US 70 over Wash?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m) and a deck 110 ft wide.

Who owns IRR US 70 over Wash?

It is owned by the State Highway Agency.