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Irr Bia Rte N321 over Sand Spring Creek

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

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

Irr Bia Rte N321 over Sand Spring Creek in San Juan 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 0 (failed condition, out of service) on the 0-9 scale.
It was built in 1936, making it 89 years old at the 2025 inventory.
It carries about 272 vehicles a day (traffic count year 2012).
It is one of 10 of the 174 inventoried bridges in San Juan County rated poor (5.7%); 10 (5.7%) 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.

Component ratings

Component	Rating (2025)	FHWA scale meaning
Deck	3	Serious condition
Superstructure	0	Failed condition, out of service
Substructure	0	Failed condition, out of service


Structure	Timber stringer or multi-beam girder
Length	about 78 ft
Location	2.0 Mi NW of Crystal N.m.
NBI structure number	00000000000N617
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
Nm-516 over Unnamed Waterway	1937	37,626	Fair
Nm-516 over Unnamed Waterway	1937	29,593	Fair
Nm-516 over Unnamed Waterway	1937	22,275	Fair
Nm-516 over Unnamed Waterway	1937	22,275	Fair
Nm-516 over Unnamed Waterway	1937	22,275	Fair
US-64 Ebl/wbl over Unnamed Waterway	1964	21,685	Good