US Bridges

NM-187 over Seco Creek

Fair

Sierra County, New Mexico · 2.2 MI N of JCT NM-152 · Structure no. 000000000002507

Built
1933
92 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
201 ft
8 main spans
Daily traffic
521
2023 count
Owner
State
State Highway Agency

About this bridge

NM-187 over Seco Creek is a wood or timber stringer/multi-beam or girder carrying NM-187 over Seco Creek in Sierra County, New Mexico. It was built in 1933, so it is 92 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.

It carries about 521 vehicles a day, roughly 12% of them trucks, projected to reach 708 by 2043. The structure is 201 ft (61.3 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesNM-187
CrossesSeco Creek
Location2.2 MI N of JCT NM-152
RouteState Highway 187
CountySierra County
StateNew Mexico
Coordinates32.98426, -107.30469
Functional classRural Major 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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
Inspection intervalevery 3 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating30.6 US tons
Inventory rating16.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans8
Design loadH 10
Structure length201 ft (61.3 m)
Longest span25 ft (7.6 m)
Deck width30 ft (9.2 m)
Roadway width29 ft (8.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic521 (2023)
Projected traffic708 by 2043
Trucks12%
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 statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$417,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was NM-187 over Seco Creek built?

It was built in 1933, making it 92 years old in 2025.

What condition is NM-187 over Seco Creek 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 December 2024.

How much traffic does NM-187 over Seco Creek carry?

About 521 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is NM-187 over Seco Creek?

The structure is 201 ft (61.3 m) long with a longest span of 25 ft (7.6 m) and a deck 30 ft wide.

Who owns NM-187 over Seco Creek?

It is owned by the State Highway Agency.