Bridge conditions in San Juan County, New Mexico
174 inventoried bridges · 10 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 174 bridges in San Juan County: 60 rated good, 104 fair, and 10 poor.
- 10 of the 174 bridges in San Juan County, New Mexico, are rated in poor condition (5.7%) in the 2025 National Bridge Inventory, as of .
- 60 bridges (34.5%) are rated good and 104 (59.8%) fair.
- The median San Juan County bridge was built in 1978.
- The busiest poor-rated bridge is IRR/US64/491 Wbl over San Juan River (built 1936), carrying about 16,829 vehicles a day.
Good 34.5% · Fair 59.8% · Poor 5.7% of 174 bridges
Bridges rated poor
Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| IRR/US64/491 Wbl over San Juan River | 1936 | 16,829 | Poor |
| Fl-4184 over Animas River | 1929 | 6,361 | Poor |
| 45-6675 over San Juan River | 1960 | 2,054 | Poor |
| Fr-6664 over Naschitti Wash | 1928 | 681 | Poor |
| 45-4599 over Irrigation Ditch | 1966 | 681 | Poor |
| 45-z003 over Cox Canyon | 1979 | 681 | Poor |
| Irr Bia Rte N321 over Sand Spring Creek | 1936 | 272 | Poor |
| Irr Bia Rte N321 over Crystal Creek | 1940 | 254 | Poor |
| Irr Bia Rte N5001 over Toadlena Wash | 1988 | 127 | Poor |
| Irr Bia Rte N9603 over Crystal Creek | 1989 | 20 | Poor |
Busiest bridges in the county
| 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 |
| US-64 over Unnamed Waterway | 1940 | 21,685 | Good |
| US-64 over Unnamed Waterway | 1940 | 21,685 | Good |
| Nm-516 over Animas River | 1985 | 21,352 | Fair |
| Nm-516 over North Farmington Ditch | 1985 | 21,352 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of New Mexico: New Mexico bridge conditions by county · every download on the data page.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.