Gates Lake, also known as Birken Lake, Tenass Lake, Halfway Lake, and Summit Lake, is a small lake located at the summit of the Pemberton Portage area of the one-time Lakes Route through the Coast Mountains, located at the summit of a low pass connecting the Upper and Lower Lillooet Country of the Southern Interior of British Columbia. Birken Lake sits at the divide between the Birkenhead and Gates-Seton drainage, known as the Pemberton Pass or Mosquito Pass, and is part of the Gates River drainage.