San Marcos River level at San Marcos
Texas · Tubing & floating
Measured at USGS 08170500 — San Marcos Rv at San Marcos, TX · NWS forecast point SRUT2
Reading taken · as of 18 min ago
Running thin — a slow, scrapey float
At 95 CFS, this gauge is running 63% of normal for mid-September — below the 149 CFS median USGS has recorded for this date across 31 years of record (1995–2026).
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Flow history at San Marcos
Daily values from USGS 08170500, updated every 15 to 60 minutes; NWS forecast for SRUT2 reissued through the day. Provisional.
Highest crests on record at San Marcos
2 on record
| Stage | Flow | Date |
|---|---|---|
| 21.29 ft | 21,500 CFS | Oct 17, 1998 |
| 10.77 ft | 2,470 CFS | Jul 8, 2002 |
Crests published by the National Weather Service.
About San Marcos River at San Marcos
In Texas — the reading paddlers, anglers and outfitters here check before committing to a shuttle. Spring-fed, floated year-round; City Park and Rio Vista.
San Marcos River at San Marcos — common questions
3 questions
Does rain upstream change San Marcos River at San Marcos 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 San Marcos high or low for this time of year?
The USGS median flow for mid-September here is 149 CFS, from 31 years of record (1995–2026). Today is 63% 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 08170500 every 15 to 60 minutes, and the National Weather Service reissues the flood forecast for SRUT2 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.