About this river
San Marcos River is a 25.6 mile river near Paddle With Style in Texas. Streamflow is measured at the USGS gauge San Marcos Rv nr Martindale, TX (site 08171400). The National Hydrography Dataset places it at stream order 7. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
2011 to 2026
San Marcos River typically runs highest in June, at a median 180 cfs, and lowest in December, at 150 cfs. The highest flow on record for any single day is 18,000 cfs, in 2014.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 152 | 112 to 212 | |
| February | 172 | 125 to 214 | |
| March | 160 | 109 to 238 | |
| April | 152 | 116 to 263 | |
| May | 165 | 131 to 362 | |
| June | 180 | 135 to 263 | |
| July | 172 | 136 to 250 | |
| August | 155 | 105 to 255 | |
| September | 155 | 102 to 257 | |
| October | 163 | 102 to 233 | |
| November | 169 | 101 to 313 | |
| December | 150 | 108 to 255 |
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 15 years of record. Statistics published by the US Geological Survey for San Marcos Rv nr Martindale, TX (site 08171400). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show San Marcos 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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