 where the shade temperature was 110 and it's even 10 to 15 degrees hotter near the river. Baird says if you notice a fellow hiker or someone on the trail is confused or disoriented, that's a red flag. They're in trouble. Even at the Grand Canyon, call 911, stop hiking and get that person into shade. Ideally in an area where the person is off of the ground because even the ground can be superheated as well.