Went back after doing this route supported last weekend and tried it out alone & unsupported! Hot day in Santee and on the trails. Lots of rattlesnake warnings. If you're looking to take on this route, brace yourself for the back side of Cowles... it's just a steep, exposed, gravel fire road. Get started early, too — 7am is pretty much ALWAYS too late at Mission Trails. I went through all of my water, but being how this attempt was unsupported I didn't let myself walk up to someone's open garage in Santee and ask for water (a la... last weekend).
Thanks Alan for submitting the info for this route! This is a great config that culminates in a joyful skip down Cowles to the parking lot. There's a vending machine down there, but it's $4 for a Powerade... Very "sweat and squeeze" of them.
Happy (Mission) Trails!
Really well done! Glad you liked the route - it's a fun one :)