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This trail is about 13 miles roundtrip and can be quite strenuous, but worth the work. From the saddle the trail is marked ahead to your right. The trail runs behind the mountain for much of the climb and makes several switchbacks. It eventually wraps back around to the southern side and climbs the last bit to the summit, where a breath-taking view is available of the Inland Empire. There was once a sign-in post at the peak. All that is left is the bottom stump of the post. Take note of where you've hiked from as this is the meeting place for multiple trails from both sides of the mountain. Head back down the way you've come or hike on over and meet up with the trails from Lytle Creek. If you do the latter make sure you've got some time and a car to take you back to where you came from. Also make sure you've brought your camera. It's definitely a shot you'll want to remember.
Henninger Flats is a small hanging basin 2600 ft above sea level in the San Gabriel Mountains in the Angeles National Forest. It was part of the Mount Wilson Toll Road. The trailhead to reach the flats is at the top end of Eaton Canyon in Altadena.