US Bridges

IRR BIA RTE N8070 over Chinle Wash

Good

Apache County, Arizona · West Edge of Rock Point · Structure no. 00000000000N252

Built
1978
47 years old
Condition
Good
inspected June 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
602 ft
12 main spans
Daily traffic
527
2022 count
Owner
Federal
Bureau of Indian Affairs

About this bridge

IRR BIA RTE N8070 over Chinle Wash is a prestressed concrete box beam or girders - multiple carrying IRR BIA RTE N8070 over Chinle Wash in Apache County, Arizona. It was built in 1978, so it is 47 years old, younger 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 527 vehicles a day, roughly 3% of them trucks, projected to reach 350 by 2040. The structure is 602 ft (183.6 m) long and 16 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesIRR BIA RTE N8070
CrossesChinle Wash
LocationWest Edge of Rock Point
RouteFederal Lands Road N8070
CountyApache County
StateArizona
Coordinates36.71822, -109.63044
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating49.1 US tons
Inventory rating36 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans12
Design loadHS 20
Structure length602 ft (183.6 m)
Longest span50 ft (15.3 m)
Deck width16 ft (4.9 m)
Roadway width14 ft (4.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic527 (2022)
Projected traffic350 by 2040
Trucks3%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerBureau of Indian Affairs
Maintained byBureau of Indian Affairs
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$2.6 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was IRR BIA RTE N8070 over Chinle Wash built?

It was built in 1978, making it 47 years old in 2025.

What condition is IRR BIA RTE N8070 over Chinle 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 June 2024.

How much traffic does IRR BIA RTE N8070 over Chinle Wash carry?

About 527 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is IRR BIA RTE N8070 over Chinle Wash?

The structure is 602 ft (183.6 m) long with a longest span of 50 ft (15.3 m) and a deck 16 ft wide.

Who owns IRR BIA RTE N8070 over Chinle Wash?

It is owned by the Bureau of Indian Affairs.