The pilot had landed at the Kalskag Airport earlier - sometime after 2200 - and was observed drinking heavily from a bottle which was finished and thrown away. He then took another fifth of whiskey out from behind his seat. The passenger asked the pilot to fly her to Russian Mission. The pilot stated he wanted to sober up first. The passenger coaxed the pilot 'like crazy' into taking her. The pilot then took the open fifth from behind his seat and put it in the passenger's lap. He then agreed to fly her to Russian Mission. At 0200 an ELT signal was picked up by a satellite. The airplane had crashed on a frozen lake 12 mi west of Kalskag. Damage was consistent with a high speed, nose low impact. The pilot's blood alcohol level was 209 mg/dL, and a 0.035 ug/mL level of tetrahydrocannabinol carboxylic acid (marijuana) was also detected in his blood. The passenger's blood alcohol level was 95 mg/dL.