Steve: see Derek Whaley’s photo and response below re: your request about the swimming hole you recall from the 1950’s. Does this look/sound familiar?

Derek writes:

It could be the swimming hole near Siesta in Brookdale. There are still remnants of a swimming hole there with stone walls and the remains of a plank-built dam. You can kind of see it in this photograph. There are actually two swimming holes in this photo, the large one at the bottom and a smaller one at the top. The top one is the one with the stone walls. It’s right under the Irwin Way bridge.

Swimming hole, San Lorenzo River near Siesta in Brookdale under Irwin Way Bridge. Courtesy of Derek Whaley.