Updated
San Marcos River
River
Live flow only — judge the water in person
Use cautionLive flow only — judge the water in person: live streamflow is available but no water-temperature sensor is nearby.
- Streamflow 86 ft³/s
- Gage height 3.68 ft
Live, provisional data from USGS gauge San Marcos Rv at Luling, TX (3.6 mi away), as of Oct 20, 1:45 AM gauge-local time.
Why, sources & official advisories
- Live streamflow is available but no water-temperature sensor is nearby. — USGS gauge 08172000, as of Oct 20, 1:45 AM gauge-local time
- No official beach advisory posted (Texas Beach Watch (Texas GLO) checked).
- Flow is below the 25th percentile for Oct 20 (median 188 ft³/s over 43 years). — USGS daily streamflow statistics, as of Oct 20, 1:45 AM gauge-local time
Official advisories
Checked against Texas Beach Watch (Texas GLO) — no advisory posted.
Fed by natural springs from the Edwards Aquifer, the San Marcos River maintains crystal-clear water at a consistent 72-78°F year-round, with depths typically 2-8 feet. The 75-mile river is a premier tubing destination just 30 miles from Austin, with outfitters offering 45-minute downtown floats to 3-hour adventures. Swimming access is available at multiple city parks. The springs are ecologically unique, home to endangered species including the Texas blind salamander and fountain darter. Parks open 6 AM to 11 PM.
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Weather at San Marcos River
62°F, Clear · H 82° / L 59° · 2% chance of rain3-day forecast
Frequently asked questions
- Where is San Marcos River?
- San Marcos River is a river in Texas.
- Can you swim at San Marcos River?
- Live flow only — judge the water in person: live streamflow is available but no water-temperature sensor is nearby. Checked October 20, 2026.
- How is San Marcos River rated?
- San Marcos River in Texas has an average visitor rating of 4.4 out of 5, based on 647 reviews.
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Location & Contact
Texas
Texas None
🌊 Best times & visiting tips
- ›Check water levels and current conditions before visiting
- ›Wear life jackets when on the water
- ›Be aware of rapids and potential hazards
- ›Respect private property along riverbanks
Features & amenities
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