US Bridges

IRR BIA RTE N8031 over Dennebito Wash

Good

Navajo County, Arizona · 0.75 MI E of Rocky Ridge · Structure no. 00000000000N548

Built
2001
24 years old
Condition
Good
inspected March 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
203 ft
2 main spans
Daily traffic
245
2023 count
Owner
Federal
Bureau of Indian Affairs

About this bridge

IRR BIA RTE N8031 over Dennebito Wash is a prestressed concrete box beam or girders - multiple carrying IRR BIA RTE N8031 over Dennebito Wash in Navajo County, Arizona. It was built in 2001, so it is 24 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 245 vehicles a day, roughly 5% of them trucks, projected to reach 287 by 2043. The structure is 203 ft (61.8 m) long and 33 ft wide. If it were closed, the detour would be 49.7 mi (80 km).

CarriesIRR BIA RTE N8031
CrossesDennebito Wash
Location0.75 MI E of Rocky Ridge
RouteFederal Lands Road N8031
StateArizona
Coordinates36.06208, -110.57606
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.1 US tons
Inventory rating35.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20 + Mod
Structure length203 ft (61.8 m)
Longest span100 ft (30.5 m)
Deck width33 ft (10 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic245 (2023)
Projected traffic287 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed49.7 mi (80 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was IRR BIA RTE N8031 over Dennebito Wash built?

It was built in 2001, making it 24 years old in 2025.

What condition is IRR BIA RTE N8031 over Dennebito 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 March 2023.

How much traffic does IRR BIA RTE N8031 over Dennebito Wash carry?

About 245 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is IRR BIA RTE N8031 over Dennebito Wash?

The structure is 203 ft (61.8 m) long with a longest span of 100 ft (30.5 m) and a deck 33 ft wide.

Who owns IRR BIA RTE N8031 over Dennebito Wash?

It is owned by the Bureau of Indian Affairs.