As far as San Gabriels use trails go, this isn't bad (even has switchbacks!), but gloves are still a good idea for the crumbly bits. The brush clearance near the top has created a field of punji sticks - so tread carefully.
Big cairn pile near the top, couldn't find a register or marker...not sure if there is either
If you go down the west side and loop back up to the parking lot it's probably 3.5 miles or so. The trail is very neglected near the creek.
Have climbed this ridge many times. Looking up the ridge from the parking area you can tell it's pretty steep so it probably doesn't tempt the hiker who just wants a moderate trail hike.
Short hike up the east ridge with beautiful all around views.