US Bridges

IRR US 70 over Flower Wash

Good

Graham County, Arizona · 34.7 MI E SR 170 · Structure no. 04308

Built
1958
67 years old
Condition
Good
inspected November 2023
Type
Culvert
Concrete Continuous
Length
32 ft
3 main spans
Daily traffic
3,538
2020 count
Owner
State
State Highway Agency

About this bridge

IRR US 70 over Flower Wash is a concrete continuous culvert carrying IRR US 70 over Flower Wash in Graham County, Arizona. It was built in 1958, so it is 67 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 3,538 vehicles a day, roughly 28% of them trucks, projected to reach 3,548 by 2040. The structure is 32 ft (9.8 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
CrossesFlower Wash
Location34.7 MI E SR 170
RouteU.S. Route 70
CountyGraham County
StateArizona
Coordinates33.04056, -109.97511
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
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58 US tons
Inventory rating35.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length32 ft (9.8 m)
Longest span10 ft (3 m)
Deck width47 ft (14.2 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,538 (2020)
Projected traffic3,548 by 2040
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$1,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was IRR US 70 over Flower Wash built?

It was built in 1958, making it 67 years old in 2025.

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

About 3,538 vehicles per day (2020 count), of which roughly 28% are trucks.

How long is IRR US 70 over Flower Wash?

The structure is 32 ft (9.8 m) long with a longest span of 10 ft (3 m) and a deck 47 ft wide.

Who owns IRR US 70 over Flower Wash?

It is owned by the State Highway Agency.