The pilot and one passenger departed on a pleasure flight from Kiana, AK on 8/1/84. Four days later, the pilot's mother traveled to Kotzebue, AK, to look for her son. She was unable to locate him and notified the FAA. A search was initiated, and on 8/6/84, the aircraft was located in a small lake near the Noatak River. A family fishing near the accident site stated they saw the aircraft flying in an erratic manner and buzzing the shoreline. An exam of the wreckage revealed damage that was typical of impacting in a stall/spin type of event. No preimpact part failure or malfunction was found. Toxicology checks of the pilot's and passenger's blood revealed alcohol levels of 0.150% and 0.210%, respectively. An interview with the passenger's wife revealed that the occupants had been drinking prior to the flight. According to witnesses, there was an overcast at less than 500 ft and the visibility was variable with occasional obscuration in rain showers and fog.