"As the river flows through Virginia into West Virginia, it picks up several warm water tributaries, making it an unusually warm water river. Along our stretch, the New River is wide, shallow, rocky and clear, which allows the sun to further enhance the warm water conditions."
The river can get as high as 85 or 90, but it is always less than your body temperature, so it still cools you off! It is just not a shock to your system and you definitely don't need to bring a wetsuit.