About this river
San Juan River is a 29.7 mile river near Sims Mesa Marina in New Mexico. Streamflow is measured at the USGS gauge San Juan River near Carracas, CO. (site 09346400). The National Hydrography Dataset places it at stream order 8. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1971 to 2026
San Juan River typically runs highest in May, at a median 1,450 cfs, and lowest in January, at 139 cfs. The highest flow on record for any single day is 6,700 cfs, in 1985.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 139 | 105 to 190 | |
| February | 151 | 109 to 210 | |
| March | 452 | 246 to 783 | |
| April | 756 | 528 to 1,290 | |
| May | 1,450 | 1,020 to 2,170 | |
| June | 1,160 | 551 to 2,070 | |
| July | 297 | 175 to 518 | |
| August | 225 | 115 to 352 | |
| September | 182 | 114 to 285 | |
| October | 193 | 133 to 331 | |
| November | 178 | 126 to 247 | |
| December | 140 | 107 to 190 |
Typical is the median of each month’s daily median values, and the usual range runs from the median 25th to the median 75th percentile, across about 55 years of record. Statistics published by the US Geological Survey for San Juan River near Carracas, CO. (site 09346400). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Boat access nearby
2 mapped launches sit in the mapped area of San Juan River, all of them public access. Ramp data comes from the USGS national boat-ramp inventory.
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show San Juan River's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.
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