I saw this trail on the map to Monte Bello, and wondered where it went. It goes near a pond to a old power pole (no wires) and now an ammo box cache. There's not much in the cache other than the blue jay feather I found on the way down. Stick to the old road to find the cache.
Update 2020-06-14:
I have updated the coordinates as I think the cache moved slightly. The cache is a medium size round plastic container.