The San Marcos River in Texas is generally characterized as a slow-to-moderate moving river, making it one of the most popular destinations for "tubing" and casual paddling in the United States. Its current speed typically ranges from 1 to 3 miles per hour, depending on recent rainfall and the flow rate from San Marcos Springs. Because it is spring-fed, the river maintains a very consistent water level and a year-round temperature of about 72°F (22°C). While the majority of the river is a gentle "lazy river" experience, there are a few areas, such as the Rio Vista Falls, where the water moves significantly faster over man-made chutes and drops, providing a brief thrill for tubers. However, even these sections are relatively mild compared to true whitewater rivers. During periods of heavy flooding, the river can become dangerously fast and is often closed to the public, but under normal conditions, it is the quintessential "slow" river where groups can link their tubes together and float leisurely through the scenic Texas Hill Country landscape without much effort.