No what you are thinking of is the house boats underwater, the park we are talkin about is yes the barstow one, if you go to the barstow one and go down to the water follow the ridge up the right underwater at about 40-60 feet more like 30 feet right now you will find the house boat. Under the private park. The two parts are right next to each other. Its not really a small small swim ... Might want a boat. I will get you the correct map and cord's here soon.
Last month when the water was really low me and two friend went there swimming, you might wanna swim surface for a bit to make it, but if not then forget it i will just get the cord's and make it easyier.