US Bridges

NM-1 over Unnamed Waterway

FairPosted for load

Socorro County, New Mexico · 18.3 MI N of Sierra C/L · Structure no. 000000000001654

Built
1931
94 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
103 ft
4 main spans
Daily traffic
40
2023 count
Owner
State
State Highway Agency

About this bridge

NM-1 over Unnamed Waterway is a wood or timber stringer/multi-beam or girder carrying NM-1 over Unnamed Waterway in Socorro County, New Mexico. It was built in 1931, so it is 94 years old, older 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. Its operating status is: posted for load restriction.

It carries about 40 vehicles a day, roughly 10% of them trucks, projected to reach 54 by 2043. The structure is 103 ft (31.3 m) long and 27 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesNM-1
CrossesUnnamed Waterway
Location18.3 MI N of Sierra C/L
RouteState Highway 1
CountySocorro County
StateNew Mexico
Coordinates33.68479, -107.06528
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating25.2 US tons
Inventory rating10.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans4
Design loadH 15
Structure length103 ft (31.3 m)
Longest span25 ft (7.6 m)
Deck width27 ft (8.1 m)
Roadway width25 ft (7.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2023)
Projected traffic54 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$184,000
NavigationNo navigation control on waterway

Frequently asked questions

When was NM-1 over Unnamed Waterway built?

It was built in 1931, making it 94 years old in 2025.

What condition is NM-1 over Unnamed Waterway 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 July 2024.

How much traffic does NM-1 over Unnamed Waterway carry?

About 40 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is NM-1 over Unnamed Waterway?

The structure is 103 ft (31.3 m) long with a longest span of 25 ft (7.6 m) and a deck 27 ft wide.

Who owns NM-1 over Unnamed Waterway?

It is owned by the State Highway Agency.