Tributaries
The largest tributary of the Rio Grande by discharge is the Rio Conchos, which contributes almost twice as much water as any other. In terms of drainage basin size the Pecos River is the largest.
| Tributary | Average discharge | Drainage basin | ||
|---|---|---|---|---|
| cu ft/s | m3/s | sq mi | km2 | |
| San Juan River | 368 | 10 | 12,950 | 33,500 |
| Rio Alamo | 130 | 3.68 | 1,675 | 4,340 |
| Rio Salado | 354 | 10.0 | 23,323 | 60,400 |
| Rio San Rodrigo | 130 | 3.68 | 1,050 | 2,720 |
| Devils River | 362 | 10.3 | 137 | 355 |
| Pecos River | 265 | 7.50 | 44,402 | 115,000 |
| Rio Conchos | 848 | 24.0 | 26,400 | 68,400 |
| Rio Puerco | 39.5 | 1.1 | 7,350 | 19,000 |
| Jemez River | 59.5 | 1.68 | 1,038 | 2,688 |
| Santa Fe River | 10.9 | 0.31 | 231 | 598.3 |
| Rio Chama | 571 | 16.2 | 3,144 | 8,143 |
| Conejos River | 176 | 4.98 | 887 | 2,297 |
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