US Bridges

IRR US 70 over Wash

Fair

Graham County, Arizona · 36.5 MI E SR 170 · Structure no. 04309

Built
1932
93 years old, rebuilt 1959
Condition
Fair
inspected November 2023
Type
Culvert
Concrete Continuous
Length
26 ft
3 main spans
Daily traffic
3,521
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 1932 and reconstructed in 1959, so it is 93 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 3,521 vehicles a day, roughly 28% of them trucks, projected to reach 3,531 by 2042. The structure is 26 ft (7.9 m) long and 48 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesIRR US 70
CrossesWash
Location36.5 MI E SR 170
RouteU.S. Route 70
CountyGraham County
StateArizona
Coordinates33.02325, -109.95631
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54 US tons
Inventory rating32 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span8 ft (2.4 m)
Deck width48 ft (14.5 m)
Roadway width45 ft (13.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,521 (2022)
Projected traffic3,531 by 2042
Trucks28%
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was IRR US 70 over Wash built?

It was built in 1932, making it 93 years old in 2025. It was reconstructed in 1959.

What condition is IRR US 70 over 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 November 2023.

How much traffic does IRR US 70 over Wash carry?

About 3,521 vehicles per day (2022 count), of which roughly 28% are trucks.

How long is IRR US 70 over Wash?

The structure is 26 ft (7.9 m) long with a longest span of 8 ft (2.4 m) and a deck 48 ft wide.

Who owns IRR US 70 over Wash?

It is owned by the State Highway Agency.