The body was located in the area of J Hart Clinton Drive and Anchor Road around 8:15 a.m. Brunicardi said a passerby noticed the body in a slough alongside a path that runs parallel to J Hart Clinton Drive.
Foster City firefighters helped recover the body from the water.
San Mateo police and the San Mateo County coroner's office are working to determine the cause of death and the identity of the man.
Anyone with information regarding the case is asked to call the San Mateo Police Department's detective bureau at (650) 522-7650 or the anonymous witness line at (650) 522-7676.
