Yesterday I hiked north from the northern most part of Boulderama, but never made it as far as that housing development. (there is this purple/pink trail right around there that is not on the map)
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As you would it expect, it started off extremely rocky but then the rocks disappear. I could only get about a quarter mile in before I hit some dense pricker bushes which seemed to continue north as far as I could see.
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I then turned east and down the ridge about 70ft and started heading back. There is a bit of a natural bench that works it's way back to around where Boulderama meets the parking loop.
Everywhere that I hiked was DRY.