US Bridges

NM-556 over South Pino Arroyo

Fair

Bernalillo County, New Mexico · 1.9 MI N of Montgomery · Structure no. 000000000010048

Built
1992
33 years old
Condition
Fair
inspected January 2025
Type
Culvert
Concrete
Length
64 ft
5 main spans
Daily traffic
11,079
2023 count
Owner
State
State Highway Agency

About this bridge

NM-556 over South Pino Arroyo is a concrete culvert carrying NM-556 over South Pino Arroyo in Bernalillo County, New Mexico. It was built in 1992, so it is 33 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 11,079 vehicles a day, roughly 12% of them trucks, projected to reach 15,067 by 2043. The structure is 64 ft (19.4 m) long. If it were closed, the detour would be 1.9 mi (3 km).

CarriesNM-556
CrossesSouth Pino Arroyo
Location1.9 MI N of Montgomery
RouteState Highway 556
Coordinates35.15847, -106.49727
Functional classUrban Other Principal 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.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans5
Design loadHS 20
Structure length64 ft (19.4 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,079 (2023)
Projected traffic15,067 by 2043
Trucks12%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1 million (2030 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was NM-556 over South Pino Arroyo built?

It was built in 1992, making it 33 years old in 2025.

What condition is NM-556 over South Pino 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 January 2025.

How much traffic does NM-556 over South Pino Arroyo carry?

About 11,079 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is NM-556 over South Pino Arroyo?

The structure is 64 ft (19.4 m) long with a longest span of 10 ft (3 m).

Who owns NM-556 over South Pino Arroyo?

It is owned by the State Highway Agency.