Water Dog Lake

1Belmont, CA
San Mateo County

Although a legend in this part of California it is said a small boy was killed by the Water Dog while he scouted the area alone. Others state the untruth to this legend as an accused murderer was convicted of the heinous crime and dumped the body of the child there. Whichever may be the truth it seems you hear gun shots and screams
and most visitors never return.

Source
Haunted Places
Shadowlands
Haunted Bay Area CBS