Nm-187 over Greenhorn Arroyo

Sierra County, New Mexico · rated Poor in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

• Nm-187 over Greenhorn Arroyo in Sierra County, New Mexico, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
• Its lowest-rated component is the superstructure, rated 4 (poor condition) on the 0-9 scale.
• It was built in 1928, making it 97 years old at the 2025 inventory.
• It carries about 297 vehicles a day (traffic count year 2023).
• Its listed owner is the state highway agency.
• It is one of 5 of the 112 inventoried bridges in Sierra County rated poor (4.5%); 5 (4.5%) are rated poor.
• A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

View this bridge on a map → (32.9442, -107.31279)

Component ratings

Bridge details

Source: FHWA National Bridge Inventory, 2025 data as reported by the New Mexico department of transportation.

Busiest bridges in Sierra County

All bridges nearby: Sierra County, NM bridge conditions · every bridge in Sierra County · New Mexico bridges.

Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.