Mount Wilson, at 5,710' above sea level, houses many radio and television antennae as well as the famous observatory. The observatory and other buildings are open only on the weekends, so if you're hiking there during the week be certain you take plenty of food and water with you. There is no water available anywhere along the trail! Henninger Flats has no flush toilets and no drinking water. There is a pit toilet available. For more information or to find out how to obtain camping permits please contact the Henninger Flats visitors center at (626) 794-0675 or contact the Angeles National Forest at (626) 574-1613. Be aware that there is little or no shade along the way until you reach Henninger Flats.