Rio San Antonio
Streamflow, conditions and background by watershed segment. Data through November 1, 2026.
Where it is
Segments are the HUC8 watersheds the gauges sit in, numbered upstream to downstream. Use the buttons to switch between the state and the river.
- 1Conejos
- river and reservoirs
- gauge
About the Rio San Antonio
This report follows 54 miles (87 km) of the Rio San Antonio, all within the Conejos watershed segment. At the lower end of the report the river drains about 382 square miles. Downstream of the mapped reach it flows into the Conejos River. Named tributaries joining it here include the Rio de los Pinos. 3 gauges with at least 26 weeks of daily flow cover 1919 to 2026.
From the archive: NHDPlus river network, WBD watersheds, NHD waterbodies, TIGER urban areas and the report's gauges.
From the headwaters down
Each watershed segment in order, with last week's flow rated against the same week in 1991–2020.
Segment 1: Conejos
138 cfs last week much above normal, 132 dry days this year.
Median conductance 110 µS/cm in the 2020s. Rain over the last 3 months: 191% of normal.
Reservoirs
No reservoir with 500 acre-feet or more of storage on this river in the National Inventory of Dams.
Water users
Surface water withdrawn, 2020
In the counties this river crosses (Rio Arriba): 144,257 acre-feet. County totals include other streams.
| Use | Share (bar) | Share | Acre-ft |
|---|---|---|---|
| Irrigated agriculture | 79% | 114,666 | |
| Reservoir evaporation | 18% | 25,890 | |
| Commercial | 2% | 3,339 | |
| Public water supply | 0% | 198 | |
| Livestock | 0% | 158 |
State Engineer, New Mexico Water Use by Categories 2020.
Sources
Numbered sources for the statements above, as they were read when the page was prepared.