US Bridges

IRR US 70 over Cottonwood Wash

Fair

Graham County, Arizona · 9.3 MI W JCT US 191 · Structure no. 00305

Built
1948
77 years old
Condition
Fair
inspected August 2023
Type
Slab
Concrete Continuous
Length
273 ft
7 main spans
Daily traffic
5,460
2022 count
Owner
State
State Highway Agency

About this bridge

IRR US 70 over Cottonwood Wash is a concrete continuous slab carrying IRR US 70 over Cottonwood Wash in Graham County, Arizona. It was built in 1948, so it is 77 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 5,460 vehicles a day, roughly 23% of them trucks, projected to reach 5,470 by 2042. The structure is 273 ft (83.2 m) long and 39 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesIRR US 70
CrossesCottonwood Wash
Location9.3 MI W JCT US 191
RouteU.S. Route 70
CountyGraham County
StateArizona
Coordinates32.8971, -109.83644
Functional classUrban 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52 US tons
Inventory rating31 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length273 ft (83.2 m)
Longest span35 ft (10.7 m)
Deck width39 ft (11.9 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,460 (2022)
Projected traffic5,470 by 2042
Trucks23%
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$2,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was IRR US 70 over Cottonwood Wash built?

It was built in 1948, making it 77 years old in 2025.

What condition is IRR US 70 over Cottonwood 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 August 2023.

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

About 5,460 vehicles per day (2022 count), of which roughly 23% are trucks.

How long is IRR US 70 over Cottonwood Wash?

The structure is 273 ft (83.2 m) long with a longest span of 35 ft (10.7 m) and a deck 39 ft wide.

Who owns IRR US 70 over Cottonwood Wash?

It is owned by the State Highway Agency.