US Bridges

NM-170 over Cottonwood Arroyo

Fair

Rio Arriba County, New Mexico · 0.8 M N of Pinon Hill · Structure no. 000000000010121

Built
2015
10 years old
Condition
Fair
inspected April 2022
Type
Culvert
Concrete
Length
27 ft
2 main spans
Daily traffic
2,359
2018 count
Owner
State
State Highway Agency

About this bridge

NM-170 over Cottonwood Arroyo is a concrete culvert carrying NM-170 over Cottonwood Arroyo in Rio Arriba County, New Mexico. It was built in 2015, so it is 10 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 6 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 2,359 vehicles a day, roughly 19% of them trucks, projected to reach 3,115 by 2038. The structure is 27 ft (8.2 m) long and 42 ft wide. If it were closed, the detour would be 42.3 mi (68 km).

Location

Open in Google Maps
CarriesNM-170
CrossesCottonwood Arroyo
Location0.8 M N of Pinon Hill
RouteState Highway 170
CountyRio Arriba County
StateNew Mexico
Coordinates36.76848, -108.23651
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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.2 US tons
Inventory rating40.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHL 93
Structure length27 ft (8.2 m)
Longest span13 ft (4 m)
Deck width42 ft (12.8 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic2,359 (2018)
Projected traffic3,115 by 2038
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed42.3 mi (68 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
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 NM-170 over Cottonwood Arroyo built?

It was built in 2015, making it 10 years old in 2025.

What condition is NM-170 over Cottonwood Arroyo 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 April 2022.

How much traffic does NM-170 over Cottonwood Arroyo carry?

About 2,359 vehicles per day (2018 count), of which roughly 19% are trucks.

How long is NM-170 over Cottonwood Arroyo?

The structure is 27 ft (8.2 m) long with a longest span of 13 ft (4 m) and a deck 42 ft wide.

Who owns NM-170 over Cottonwood Arroyo?

It is owned by the State Highway Agency.