US Bridges

IRR BIA RTE N31 over Thodilidonih Wash

Good

McKinley County, New Mexico · 9 Miles NE of Navajo Nm · Structure no. 0000N36780B0692

Built
2016
9 years old
Condition
Good
inspected March 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
241 ft
3 main spans
Daily traffic
136
2023 count
Owner
Federal
Bureau of Indian Affairs

About this bridge

IRR BIA RTE N31 over Thodilidonih Wash is a prestressed concrete box beam or girders - single or spread carrying IRR BIA RTE N31 over Thodilidonih Wash in McKinley County, New Mexico. It was built in 2016, so it is 9 years old, younger than the New Mexico average of 51.5 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 136 vehicles a day, roughly 5% of them trucks, projected to reach 256 by 2032. The structure is 241 ft (73.6 m) long and 30 ft wide. If it were closed, the detour would be 9.3 mi (15 km).

Location

Open in Google Maps
CarriesIRR BIA RTE N31
CrossesThodilidonih Wash
Location9 Miles NE of Navajo Nm
RouteFederal Lands Road 0N31
CountyMcKinley County
StateNew Mexico
Coordinates35.94072, -108.97615
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
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 evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.7 US tons
Inventory rating35.9 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length241 ft (73.6 m)
Longest span79 ft (24.1 m)
Deck width30 ft (9 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic136 (2023)
Projected traffic256 by 2032
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.3 mi (15 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 N31 over Thodilidonih Wash built?

It was built in 2016, making it 9 years old in 2025.

What condition is IRR BIA RTE N31 over Thodilidonih 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 N31 over Thodilidonih Wash carry?

About 136 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is IRR BIA RTE N31 over Thodilidonih Wash?

The structure is 241 ft (73.6 m) long with a longest span of 79 ft (24.1 m) and a deck 30 ft wide.

Who owns IRR BIA RTE N31 over Thodilidonih Wash?

It is owned by the Bureau of Indian Affairs.