US Bridges

NM-1 over Ryan Hill Canyon

FairPosted for load

Socorro County, New Mexico · 2.7 M E&n San Marcial · Structure no. 000000000001648

Built
1931
94 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
302 ft
12 main spans
Daily traffic
174
2023 count
Owner
State
State Highway Agency

About this bridge

NM-1 over Ryan Hill Canyon is a wood or timber stringer/multi-beam or girder carrying NM-1 over Ryan Hill Canyon 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 302 ft (92.2 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
CrossesRyan Hill Canyon
Location2.7 M E&n San Marcial
RouteState Highway 1
CountySocorro County
StateNew Mexico
Coordinates33.73603, -106.97678
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating18 US tons
Inventory rating7.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans12
Design loadH 15
Structure length302 ft (92.2 m)
Longest span25 ft (7.6 m)
Deck width20 ft (6.1 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2.7 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was NM-1 over Ryan Hill Canyon built?

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

What condition is NM-1 over Ryan Hill Canyon 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 October 2024.

How much traffic does NM-1 over Ryan Hill Canyon carry?

About 174 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is NM-1 over Ryan Hill Canyon?

The structure is 302 ft (92.2 m) long with a longest span of 25 ft (7.6 m) and a deck 20 ft wide.

Who owns NM-1 over Ryan Hill Canyon?

It is owned by the State Highway Agency.