US Bridges

IRR BIA RTE N13 over Little Shiprock Wash

Fair

San Juan County, New Mexico · 1.0 MI South Mitten Rock · Structure no. 00000000000N236

Built
1975
50 years old
Condition
Fair
inspected June 2024
Type
Culvert
Concrete Continuous
Length
73 ft
5 main spans
Daily traffic
1,675
2022 count
Owner
Federal
Bureau of Indian Affairs

About this bridge

IRR BIA RTE N13 over Little Shiprock Wash is a concrete continuous culvert carrying IRR BIA RTE N13 over Little Shiprock Wash in San Juan County, New Mexico. It was built in 1975, so it is 50 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.

It carries about 1,675 vehicles a day, roughly 20% of them trucks, projected to reach 1,964 by 2040. The structure is 73 ft (22.2 m) long and 50 ft wide. If it were closed, the detour would be 49.7 mi (80 km).

Location

Open in Google Maps
CarriesIRR BIA RTE N13
CrossesLittle Shiprock Wash
Location1.0 MI South Mitten Rock
RouteFederal Lands Road 0N13
CountySan Juan County
StateNew Mexico
Coordinates36.59856, -108.95256
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
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48 US tons
Inventory rating35.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans5
Design loadHS 20
Structure length73 ft (22.2 m)
Longest span14 ft (4.2 m)
Deck width50 ft (15.2 m)
Roadway width41 ft (12.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,675 (2022)
Projected traffic1,964 by 2040
Trucks20%
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 N13 over Little Shiprock Wash built?

It was built in 1975, making it 50 years old in 2025.

What condition is IRR BIA RTE N13 over Little Shiprock 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 June 2024.

How much traffic does IRR BIA RTE N13 over Little Shiprock Wash carry?

About 1,675 vehicles per day (2022 count), of which roughly 20% are trucks.

How long is IRR BIA RTE N13 over Little Shiprock Wash?

The structure is 73 ft (22.2 m) long with a longest span of 14 ft (4.2 m) and a deck 50 ft wide.

Who owns IRR BIA RTE N13 over Little Shiprock Wash?

It is owned by the Bureau of Indian Affairs.