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45-1120 over Nm-170

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

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

45-1120 over Nm-170 in San Juan 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 deck, rated 5 (fair condition) on the 0-9 scale.
It was built in 1986, making it 39 years old at the 2025 inventory.
It carries about 681 vehicles a day (traffic count year 2023).
Its listed owner is the county highway agency.
It is one of 104 of the 174 inventoried bridges in San Juan County rated fair (59.8%); 10 (5.7%) 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	Steel stringer or multi-beam girder
Length	about 120 ft
Location	16.8 Mi N of US-64
NBI structure number	000000000009036
Condition class	Fair

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