US Bridges

NM-45 over San Antonio Arroyo

Fair

Bernalillo County, New Mexico · 2.32 M N JCT I-40/NM-45 · Structure no. 000000000008335

Built
1978
47 years old
Condition
Fair
inspected September 2023
Type
Culvert
Concrete
Length
44 ft
4 main spans
Daily traffic
30,903
2020 count
Owner
State
State Highway Agency

About this bridge

NM-45 over San Antonio Arroyo is a concrete culvert carrying NM-45 over San Antonio Arroyo in Bernalillo County, New Mexico. It was built in 1978, so it is 47 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 30,903 vehicles a day, roughly 7% of them trucks, projected to reach 52,867 by 2040. The structure is 44 ft (13.4 m) long. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesNM-45
CrossesSan Antonio Arroyo
Location2.32 M N JCT I-40/NM-45
RouteState Highway 448
CountyBernalillo County
StateNew Mexico
Coordinates35.13897, -106.70026
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 inspectionSeptember 2023
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.1 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans4
Design loadHS 20
Structure length44 ft (13.4 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 traffic30,903 (2020)
Projected traffic52,867 by 2040
Trucks7%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was NM-45 over San Antonio Arroyo built?

It was built in 1978, making it 47 years old in 2025.

What condition is NM-45 over San Antonio 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 September 2023.

How much traffic does NM-45 over San Antonio Arroyo carry?

About 30,903 vehicles per day (2020 count), of which roughly 7% are trucks.

How long is NM-45 over San Antonio Arroyo?

The structure is 44 ft (13.4 m) long with a longest span of 10 ft (3 m).

Who owns NM-45 over San Antonio Arroyo?

It is owned by the State Highway Agency.