The lower part begins at the outlet of Canyon Lake, near New Braunfels. The section between Canyon Dam and New Braunfels is the most heavily used in terms of recreation. It is a popular destination for whitewater rafters, canoeists, kayakers, and tubing. When the water is flowing at less than there could be hundreds if not thousands of tubes on this stretch of it. At flows greater than , there should be very few tubes on the water. Flows greater than and less than are ideal for rafting and paddling. The flow is controlled by Canyon Dam, and by the amount of rainfall the area has received. It is joined by the Comal River in New Braunfels and the San Marcos River about two miles (3 km) west of Gonzales. The part below the San Marcos River, as well as the latter, is part of the course for the Texas Water Safari.