US Bridges

IRR US 70 over Dry Wash

Fair

Graham County, Arizona · 28.5 MI E JCT SR 170 · Structure no. 00513

Built
1932
93 years old, rebuilt 1961
Condition
Fair
inspected September 2023
Type
Slab
Concrete
Length
112 ft
5 main spans
Daily traffic
2,940
2022 count
Owner
State
State Highway Agency

About this bridge

IRR US 70 over Dry Wash is a concrete slab carrying IRR US 70 over Dry Wash in Graham County, Arizona. It was built in 1932 and reconstructed in 1961, 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 2,940 vehicles a day, roughly 25% of them trucks, projected to reach 2,950 by 2042. The structure is 112 ft (34.1 m) long and 43 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesIRR US 70
CrossesDry Wash
Location28.5 MI E JCT SR 170
RouteU.S. Route 70
CountyGraham County
StateArizona
Coordinates33.09087, -110.06532
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47 US tons
Inventory rating28 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans5
Design loadH 15
Structure length112 ft (34.1 m)
Longest span22 ft (6.7 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was IRR US 70 over Dry Wash built?

It was built in 1932, making it 93 years old in 2025. It was reconstructed in 1961.

What condition is IRR US 70 over Dry 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 September 2023.

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

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

How long is IRR US 70 over Dry Wash?

The structure is 112 ft (34.1 m) long with a longest span of 22 ft (6.7 m) and a deck 43 ft wide.

Who owns IRR US 70 over Dry Wash?

It is owned by the State Highway Agency.