Just a few few weeks ago, a buddy and I were fishing the upper Colorado River after a spell of hot weather and pretty low water. Toward the end of the day I thought it might be a good idea to check the water temps as we knew they were not exactly where they should be. My thermometer read nearly 70 degrees. We couldn't believe it and decided to stop fishing immediately. The water felt warm, but not that warm... While we did the responsible thing, I know many people do not. It's easier said then done.