US Bridges

IRR US 70 over Holyoak Wash

Fair

Graham County, Arizona · 31.5 MI E JCT IRR 170 · Structure no. 00514

Built
1932
93 years old, rebuilt 1958
Condition
Fair
inspected September 2023
Type
Slab
Concrete
Length
90 ft
4 main spans
Daily traffic
3,521
2022 count
Owner
State
State Highway Agency

About this bridge

IRR US 70 over Holyoak Wash is a concrete slab carrying IRR US 70 over Holyoak Wash in Graham County, Arizona. It was built in 1932 and reconstructed in 1958, 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 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 3,521 vehicles a day, roughly 28% of them trucks, projected to reach 3,531 by 2042. The structure is 90 ft (27.4 m) long and 47 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesIRR US 70
CrossesHolyoak Wash
Location31.5 MI E JCT IRR 170
RouteU.S. Route 70
CountyGraham County
StateArizona
Coordinates33.07098, -110.01875
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56 US tons
Inventory rating33 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length90 ft (27.4 m)
Longest span22 ft (6.7 m)
Deck width47 ft (14.2 m)
Roadway width44 ft (13.3 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 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 Holyoak Wash built?

It was built in 1932, making it 93 years old in 2025. It was reconstructed in 1958.

What condition is IRR US 70 over Holyoak 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 Holyoak Wash carry?

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

How long is IRR US 70 over Holyoak Wash?

The structure is 90 ft (27.4 m) long with a longest span of 22 ft (6.7 m) and a deck 47 ft wide.

Who owns IRR US 70 over Holyoak Wash?

It is owned by the State Highway Agency.