//
There are many well-marked trails accessible from Icehouse Canyon. The trailhead is easy to find. Heading up from Calremont/Upland take the road until it ends. Instead of making a right to continue up to Mount Baldy, simply follow the road the short distance to the parking lot. The old Icehouse is at the top of the parking lot and the trailhead is to the right.
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.