Black bears are known to wander into the park from the Abajo Mountains, which border The Needles district. They have been sighted in Salt Creek Canyon and many neighboring canyons, as well as along the Colorado River. Backpackers in some of these areas may need bear canisters. Lightning and Flash Floods. Storms and flash floods can be powerful and sudden. When lightning is present, there is no safe place outside. Return to your vehicle, or get indoors. If you can't get indoors, avoid lone trees, cliff edges, and high ridges. Crouch low to the ground. Never try to cross a wash that is flooding.