US Bridges

IRR I 40; WB over Window Rock RD

Poor

Apache County, Arizona · 18.0 MI E JCT US 191 · Structure no. 00678

Built
1964
61 years old
Condition
Poor
inspected July 2024
Type
Frame
Concrete
Length
34 ft
1 main span
Daily traffic
10,415
2022 count
Owner
State
State Highway Agency

About this bridge

IRR I 40; WB over Window Rock RD is a concrete frame carrying IRR I 40; WB over Window Rock RD in Apache County, Arizona. It was built in 1964, so it is 61 years old, older than the Arizona average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 10,415 vehicles a day, roughly 43% of them trucks, projected to reach 10,425 by 2042. The structure is 34 ft (10.4 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesIRR I 40; WB
CrossesWindow Rock RD
Location18.0 MI E JCT US 191
RouteInterstate 40
CountyApache County
StateArizona
Coordinates35.33805, -109.06844
Functional classRural Principal Arterial - Interstate

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57 US tons
Inventory rating34 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length34 ft (10.4 m)
Longest span30 ft (9.1 m)
Deck width40 ft (12.2 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,415 (2022)
Projected traffic10,425 by 2042
Trucks43%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 (2018 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was IRR I 40; WB over Window Rock RD built?

It was built in 1964, making it 61 years old in 2025.

What condition is IRR I 40; WB over Window Rock RD in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in July 2024.

How much traffic does IRR I 40; WB over Window Rock RD carry?

About 10,415 vehicles per day (2022 count), of which roughly 43% are trucks.

How long is IRR I 40; WB over Window Rock RD?

The structure is 34 ft (10.4 m) long with a longest span of 30 ft (9.1 m) and a deck 40 ft wide.

Who owns IRR I 40; WB over Window Rock RD?

It is owned by the State Highway Agency.