Understanding San Marcos River conditions
Spring flow helps the San Marcos remain a popular year-round river. Current flow still matters for tubing, paddling and river access, especially after heavy rainfall.
Popular activities
- Tubing through San Marcos
- Paddling and kayaking
- Swimming and snorkeling
- Urban river access
Is the river safe today?
A flow number alone cannot determine safety. Conditions that feel gentle at one access point may be hazardous downstream. Consider recent rain, water temperature, dam releases, debris and local closures. Never enter floodwater.
How often does the gauge update?
Most automated USGS gauges report repeatedly throughout the day, but update frequency and available measurements vary by station. A missing value does not mean the river is safe or unchanged.
Important: River Flow Today is an informational guide, not an official warning service. For flooding and emergencies, follow the National Weather Service and local authorities.