Los Pinos River
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.
- 1Upper San Juan
- river and reservoirs
- gauge
About the Los Pinos River
This report follows 82 miles (132 km) of the Los Pinos River, all within the Upper San Juan watershed segment. At the lower end of the report the river drains about 633 square miles. Downstream of the mapped reach it flows into the San Juan River. Named tributaries joining it here include the Beaver Creek. Reservoirs on this reach: Navajo Reservoir and Vallecito Reservoir. 3 gauges with at least 26 weeks of daily flow cover 1927 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: Upper San Juan
1,649 cfs last week much above normal, 3 dry days this year.
Median conductance 204 µS/cm in the 2020s. Rain over the last 3 months: 248% of normal.
Reservoirs
| Reservoir | Completed | Main purpose | Storage, acre-ft |
|---|---|---|---|
| Vallecito Dam | 1941 | Fish and Wildlife Pond | 136,200 |
From the archive: National Inventory of Dams (USACE) and the reservoir registry.
Water users
Surface water withdrawn, 2020
In the counties this river crosses (San Juan): 412,312 acre-feet. County totals include other streams.
| Use | Share (bar) | Share | Acre-ft |
|---|---|---|---|
| Irrigated agriculture | 80% | 330,370 | |
| Power | 8% | 32,474 | |
| Reservoir evaporation | 7% | 27,174 | |
| Public water supply | 5% | 21,357 | |
| Commercial | 0% | 913 |
State Engineer, New Mexico Water Use by Categories 2020.
Public water systems beside the river
Navajo Dam Domestic Water Consumers Inc, Pine River MDCA
State Engineer's public water systems layer (service areas within 2 km).
Sources
Numbered sources for the statements above, as they were read when the page was prepared.