10 USGS Streamgages · Colorado River system
San Juan River flows and levels
San Juan River is gauged at 10 USGS streamgages in Colorado, New Mexico, and Utah, each tracked by Rivermatics. The mainstem runs about 393 miles (632 km) from headwaters to outlet. It drains into the Colorado River system. It drains roughly 24,481 square miles at its outlet. The gauged reach falls about 3,369 feet, from 7,056 feet down to 3,687. Rivermatics issues a daily machine-learned 14-day flow outlook at 9 of them.
Gauges on this river, upstream to downstream
Ordered by drainage area, which is how far down the river each gauge sits. April and July figures are long-term median daily flows for that month from the USGS record — historical normals, not a forecast and not today's reading.
| Gauge | State | Drainage sq mi | Elevation ft | April p50 cfs | July p50 cfs | Forecast |
|---|---|---|---|---|---|---|
| San Juan River at Pagosa Springs, CO | CO | 281 | 7,056 | 490.2 | 215.9 | 14-day |
| San Juan River near Carracas, CO | CO | 1,250 | 6,092 | 797.3 | 338.2 | 14-day |
| San Juan River near Archuleta, NM | NM | 3,260 | 5,663 | 537.4 | 664.2 | 14-day |
| San Juan River at Bloomfield, NM | NM | 5,350 | 5,422 | 383.3 | 518.8 | 14-day |
| San Juan River at Farmington, NM | NM | 7,240 | 5,243 | 1,787.7 | 1,310.6 | 14-day |
| San Juan River at Shiprock, NM | NM | 12,900 | 4,886 | 1,744.3 | 1,199.9 | 14-day |
| San Juan River at Four Corners, CO | CO | 14,600 | 4,614 | 1,490.7 | 1,245.5 | 14-day |
| San Juan River near Bluff, UT | UT | 23,000 | 4,068 | 1,924.3 | 1,365.6 | 14-day + temp |
| San Juan River below Piute Farms Wash near Monument Vly, UT | UT | 24,000 | 3,687 | — | — | 14-day |
| San Juan River near Co Rd 119 at Pagosa Springs, CO | CO | — | 7,042 | — | — | — |
Common questions
- How many gauges are on the San Juan River?
- Rivermatics tracks 10 USGS streamgages on the San Juan River, across Colorado, New Mexico, and Utah. Each has its own page with the site's full flow record and monthly normals. The river may carry other gauges that publish neither daily values nor discharge statistics; those are not tracked here.
- Is there a flow forecast for the San Juan River?
- Yes, at 9 of the 10 gauges. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on each basin's observed flows, weather and snowpack, and issues a daily outlook reaching 14 days ahead: a median estimate inside a confidence band, not a single number to bet on. Every forecast is scored against days the model never trained on, and that track record is published on each gauge's live screen.
- What river system is the San Juan River part of?
- The San Juan River drains into the Colorado River system — it is a tributary somewhere in that chain, following the flowpath down to its terminal river. Rivermatics builds this from the USGS/geoconnex reference-mainstem network rather than from names.
- Can I use San Juan River data for flood or safety decisions?
- No. Rivermatics provides estimates, not guarantees, and the readings and forecasts here may be delayed, inaccurate, or wrong. Do not use them for navigation or for any safety, rescue, or emergency decision. Check the National Weather Service and USGS directly, and use your own judgment.
Other rivers in the Colorado River system
- Gila River 17 gauges
- Animas River 9 gauges
- Gore Creek 9 gauges
- Green River 9 gauges
- Little Colorado River 9 gauges
- Virgin River 8 gauges
- Yampa River 8 gauges
- Dolores River 7 gauges