Fallbrook Ladera Vista

This is another elusive body of water.
Or perhaps I should say more specifically,
we found it more than once (physically)
but couldn't locate it on the map later.

It's off the main roadway,
on a private road with maybe 30 houses,
horse fences, meadows, woods, etc.

Nice windmill and view of snow-capped mountains (in December).

The most recent time I visited someone was having a party.
There were about 12 cars scattered on their side of the road. 
That made me inch along, and I saw an upper pond to my right.