US Bridges

NM-1 over Unnamed Waterway

FairPosted for load

Socorro County, New Mexico · 5.2 M E and N/San Marcial · Structure no. 000000000001647

Built
1931
94 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
102 ft
4 main spans
Daily traffic
174
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 174 vehicles a day, roughly 10% of them trucks, projected to reach 236 by 2043. The structure is 102 ft (31.2 m) long and 20 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesNM-1
CrossesUnnamed Waterway
Location5.2 M E and N/San Marcial
RouteState Highway 1
CountySocorro County
StateNew Mexico
Coordinates33.75269, -106.93931
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating27 US tons
Inventory rating12.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans4
Design loadH 15
Structure length102 ft (31.2 m)
Longest span25 ft (7.6 m)
Deck width20 ft (6.2 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic174 (2023)
Projected traffic236 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$893,000
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 174 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is NM-1 over Unnamed Waterway?

The structure is 102 ft (31.2 m) long with a longest span of 25 ft (7.6 m) and a deck 20 ft wide.

Who owns NM-1 over Unnamed Waterway?

It is owned by the State Highway Agency.