Looks like a shallow swamp to me. Also fenced maybe private land. Nice countryside but no one seems to have any information on this lake Says Ronny
Yep, outdoors amusing stuff truly is plentiful here in the San Francisco Mountains. Apache Creek is a good campground nearby, and you'll meet a lot of folks from Aragon here. The nearby grade II-III, 40-mile-in-length San Francisco to Pleasanton section of whitewater on San Francisco River is a lot of fun. When the
conditions are right this section of San Francisco River is an amusing section of river for whitewater rafting or kayaking. Don't neglect to check current conditions before heading out whitewater rafting or kayaking to guarantee your safety.