Teachet, J.A. 1992 Journal Day Canyon, San Gabriel Mountains, near roads Cucamonga, San Bernardino Cr, California. Elevation 2800 feet April 7 gallery forest with trees 20-30 feet tall, 8-16" DBH, and fully leafed out. (CrM) Mostly excluded from the immediate margins of the creek were other tree species of the canyon bottom: Quercus chrysolepis & Calif. Bay; shrubs include manzanita & mountain mahogany on the lower canyon slopes. Remarkable was one very large (70-35' tall, 35-46" dbh) maple on a sun exposed rocky bench about 30 yards downstream of the nearest riparian woodland. Evidently, the gallery forest once extended downstream a great distance than now. This giant maple is sickly, and will not likely survive many more years. There are a scattered few maples as understory trees (supposing normally) in its riparian creed upstream. The alder forest extends about 1/4 mile, then continues as a bordering strip adjacent to the creek for 3/4 mile of otherwise bouldery flats to a narrow spot into the canyon, where the riparian woodland once again brokens. The breadth of the canyon is 50-150 yards. Canyon slopes are appears 60°. These slopes once had spotty coverage with conifers. The pines have almost all been fire-killed, but the fire seem to have survived much better. Once above the meadows, the trail becomes very difficult to follow, especially if one desires to stay out of the 10-15' wide creek. Canyon orientation is mostly NW draining to SE. Next signed road is Etiwanda Avenue, which one follows north to get to the gravel roads leading to the canyon (Etiwanda intersects all major E-W roads in the area, including Interstate 10). Due the absence of keys to the gates, it's a 1 1/2 mile uphill walk to the canyon. This is really a splendid place but for one serious debit: the long haul is pretty wicked. The air toward the populated areas below is decidedly crisp.