US Bridges

IRR BIA RTE N471 over Tinian Mission Wash

Good

McKinley County, New Mexico · 2 Mi. NE Tinian Mission · Structure no. 00000000000N492

Built
2010
15 years old
Condition
Good
inspected April 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
124 ft
2 main spans
Daily traffic
218
2021 count
Owner
Federal
Bureau of Indian Affairs

About this bridge

IRR BIA RTE N471 over Tinian Mission Wash is a prestressed concrete box beam or girders - multiple carrying IRR BIA RTE N471 over Tinian Mission Wash in McKinley County, New Mexico. It was built in 2010, so it is 15 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 218 vehicles a day, roughly 5% of them trucks, projected to reach 324 by 2039. The structure is 124 ft (37.7 m) long and 28 ft wide. If it were closed, the detour would be 21.1 mi (34 km).

Location

Open in Google Maps
CarriesIRR BIA RTE N471
CrossesTinian Mission Wash
Location2 Mi. NE Tinian Mission
RouteFederal Lands Road 0N471
CountyMcKinley County
StateNew Mexico
Coordinates35.85647, -107.31164
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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum 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 alignment6: Equal to present minimum criteria
Operating rating49.1 US tons
Inventory rating36 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length124 ft (37.7 m)
Longest span59 ft (18 m)
Deck width28 ft (8.6 m)
Roadway width27 ft (8.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic218 (2021)
Projected traffic324 by 2039
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.1 mi (34 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 N471 over Tinian Mission Wash built?

It was built in 2010, making it 15 years old in 2025.

What condition is IRR BIA RTE N471 over Tinian Mission 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 April 2023.

How much traffic does IRR BIA RTE N471 over Tinian Mission Wash carry?

About 218 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is IRR BIA RTE N471 over Tinian Mission Wash?

The structure is 124 ft (37.7 m) long with a longest span of 59 ft (18 m) and a deck 28 ft wide.

Who owns IRR BIA RTE N471 over Tinian Mission Wash?

It is owned by the Bureau of Indian Affairs.