San Juan County Bridge Report Card
San Juan County scores 75 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
San Juan County, New Mexico
San Juan County has 174 bridges in the National Bridge Inventory, with 10 rated poor and 10 rated scour-critical. Its poor-condition share of 5.7% is above the 4.3% statewide average. Poor-condition bridges carry about 27,960 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives San Juan County a Bridge Condition Exposure Score of 75/100 (C). The county has 174 bridges in the National Bridge Inventory, including 10 in poor condition and 10 rated scour-critical. Poor-condition bridges carry about 27,960 daily vehicle crossings. Poor condition does not mean unsafe; bridges judged unsafe are closed or restricted by transportation agencies.
How the Score Breaks Down
| Factor | Weight | County Value | Penalty |
|---|---|---|---|
| Poor-condition bridge share | 40 | 5.7% | 11.5 |
| Poor-condition traffic exposure | 25 | 2.7% of measured traffic | 2.0 |
| Scour-critical bridge share | 20 | 5.7% | 11.5 |
| Average age vs national baseline | 10 | 48 years vs 48 nationally | 0.1 |
| Traffic-data completeness | 5 | 1,044,684 measured daily crossings | 0.0 |
Score = 100 minus weighted penalties. The score is a comparative research signal, not an official safety rating. Read the full methodology.
County Comparisons
| County Poor-Condition Share | 5.7% |
| State Poor-Condition Share | 4.3% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 5.7% |
| Average Bridge Age | 48 years |
| Poor-Condition Traffic Exposure | 27,960 vehicles/day |
Bridges to Watch
Top Bridges to Watch in San Juan County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Fr-6664 over Naschitti Wash | Poor condition + traffic exposure | Poor | 681 | 1928 |
| 45-4599 over Irrigation Ditch | Poor condition + traffic exposure | Poor | 681 | 1966 |
| 45-z003 over Cox Canyon | Poor condition + traffic exposure | Poor | 681 | 1979 |
| Irr/us64/491 Wbl over San Juan River | Poor condition + traffic exposure | Poor | 16,829 | 1936 |
| Fl-4184 over Animas River | Poor condition + traffic exposure | Poor | 6,361 | 1929 |
| 45-6675 over San Juan River | Poor condition + traffic exposure | Poor | 2,054 | 1960 |
| IRR BIA RTE N321 over Sand Spring Creek | Poor condition + traffic exposure | Poor | 272 | 1936 |
| IRR BIA RTE N321 over Crystal Creek | Poor condition + traffic exposure | Poor | 254 | 1940 |
| IRR BIA RTE N5001 over Toadlena Wash | Poor condition + traffic exposure | Poor | 127 | 1988 |
| IRR BIA RTE N9603 over Crystal Creek | Poor condition + traffic exposure | Poor | 20 | 1989 |
Important safety note
Poor condition does not mean a bridge is unsafe. It means at least one major component has significant deterioration and the bridge is a priority for maintenance, repair, or replacement. Bridges judged unsafe are closed or restricted by transportation agencies.