US Bridges

IRR BIA RTE N9660 over Wash

FairPosted for load

McKinley County, New Mexico · 4.2MI SE of Twin Lakes Nm · Structure no. 00000000000N655

Built
1976
49 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
105 ft
4 main spans
Daily traffic
83
2023 count
Owner
Federal
Bureau of Indian Affairs

About this bridge

IRR BIA RTE N9660 over Wash is a steel stringer/multi-beam or girder carrying IRR BIA RTE N9660 over Wash in McKinley County, New Mexico. It was built in 1976, so it is 49 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 fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for other load-capacity restriction.

It carries about 83 vehicles a day, roughly 3% of them trucks, projected to reach 97 by 2040. The structure is 105 ft (32 m) long and 14 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

CarriesIRR BIA RTE N9660
CrossesWash
Location4.2MI SE of Twin Lakes Nm
RouteFederal Lands Road N9660
Coordinates35.68586, -108.70644
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating55.9 US tons
Inventory rating39.9 US tons

Structure

MaterialSteel
DeckOpen grating
Main spans4
Design loadUnknown
Structure length105 ft (32 m)
Longest span29 ft (8.9 m)
Deck width14 ft (4.3 m)
Roadway width13 ft (4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic83 (2023)
Projected traffic97 by 2040
Trucks3%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 N9660 over Wash built?

It was built in 1976, making it 49 years old in 2025.

What condition is IRR BIA RTE N9660 over Wash in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in March 2023.

How much traffic does IRR BIA RTE N9660 over Wash carry?

About 83 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is IRR BIA RTE N9660 over Wash?

The structure is 105 ft (32 m) long with a longest span of 29 ft (8.9 m) and a deck 14 ft wide.

Who owns IRR BIA RTE N9660 over Wash?

It is owned by the Bureau of Indian Affairs.