San Marcos River level at Martindale
Texas · Tubing & floating
Measured at USGS 08171400 — San Marcos Rv nr Martindale, TX · NWS forecast point SMRT2
Reading taken · as of 18 min ago
Running thin — a slow, scrapey float
At 113 CFS, this gauge is running 73% of normal for mid-September — below the 154 CFS median USGS has recorded for this date across 15 years of record (2011–2026).
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Flow history at Martindale
Daily values from USGS 08171400, updated every 15 to 60 minutes; NWS forecast for SMRT2 reissued through the day. Provisional.
Highest crests on record at Martindale
7 on record
| Stage | Flow | Date |
|---|---|---|
| 40.68 ft | 93,300 CFS | Oct 31, 2013 |
| 36.18 ft | — | Oct 30, 2015 |
| 26.23 ft | — | May 24, 2015 |
| 24.71 ft | 29,235 CFS | Oct 14, 2021 |
| 24.32 ft | 12,987 CFS | May 9, 2019 |
| 20.40 ft | 8,764 CFS | May 4, 2019 |
| 18.59 ft | — | May 18, 2015 |
Crests published by the National Weather Service.
About San Marcos River at Martindale
In Texas — the reading paddlers, anglers and outfitters here check before committing to a shuttle. Cottonseed Rapid; Texas State Tubes thresholds.
San Marcos River at Martindale — common questions
3 questions
Does rain upstream change San Marcos River at Martindale quickly?
Yes. It is free-flowing, so rain upstream moves it directly. Several feet in a few hours is normal after a heavy storm.
Is San Marcos River at Martindale high or low for this time of year?
The USGS median flow for mid-September here is 154 CFS, from 15 years of record (2011–2026). Today is 73% of it. The comparison is what makes the raw number mean anything: the same reading is a drought on one river and a flood on another.
How often does this reading update?
USGS transmits from gauge 08171400 every 15 to 60 minutes, and the National Weather Service reissues the flood forecast for SMRT2 a few times a day — more often when the river is rising. This page refreshes from both when you open it. The timestamp is in the gauge's local time.