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Nm-456 over Unnamed Waterway

Union County, New Mexico · rated Fair in the 2025 National Bridge Inventory

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

Nm-456 over Unnamed Waterway in Union County, New Mexico, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
It was built in 1961, making it 64 years old at the 2025 inventory.
It carries about 73 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 30 of the 68 inventoried bridges in Union County rated fair (44.1%); 1 (1.5%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings


Structure	Timber stringer or multi-beam girder
Length	about 62 ft
Location	27.7 M NE of Jct US-64/87
NBI structure number	000000000006266
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US-87 over Unnamed Waterway	1961	6,226	Good
US-87 over Unnamed Waterway	1961	6,226	Good
US-64 over Unnamed Waterway	1937	5,229	Good
US-64 over Unnamed Waterway	1937	5,229	Good
US-64 over Unnamed Waterway	1937	5,229	Fair
US-64/87 Ebl/wbl over Unnamed Waterway	1959	4,234	Good