US Bridges

NM-170 over Unnamed Waterway

Good

Rio Arriba County, New Mexico · 5.5 M N of Pinon Hills · Structure no. 000000000010129

Built
2018
7 years old
Condition
Good
inspected April 2022
Type
Culvert
Steel
Length
45 ft
2 main spans
Daily traffic
2,359
2018 count
Owner
State
State Highway Agency

About this bridge

NM-170 over Unnamed Waterway is a steel culvert carrying NM-170 over Unnamed Waterway in Rio Arriba County, New Mexico. It was built in 2018, so it is 7 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 2,359 vehicles a day, roughly 19% of them trucks, projected to reach 3,115 by 2038. The structure is 45 ft (13.7 m) long and 45 ft wide. If it were closed, the detour would be 42.3 mi (68 km).

Location

Open in Google Maps
CarriesNM-170
CrossesUnnamed Waterway
Location5.5 M N of Pinon Hills
RouteState Highway 170
CountyRio Arriba County
StateNew Mexico
Coordinates36.83299, -108.22821
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionApril 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.4 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadHS 20
Structure length45 ft (13.7 m)
Longest span10 ft (3 m)
Deck width45 ft (13.7 m)
Roadway width45 ft (13.7 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 Unnamed Waterway built?

It was built in 2018, making it 7 years old in 2025.

What condition is NM-170 over Unnamed Waterway 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 2022.

How much traffic does NM-170 over Unnamed Waterway carry?

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

How long is NM-170 over Unnamed Waterway?

The structure is 45 ft (13.7 m) long with a longest span of 10 ft (3 m) and a deck 45 ft wide.

Who owns NM-170 over Unnamed Waterway?

It is owned by the State Highway Agency.