This is a list of reported, but lesser known, lake monsters.
Moses Lake Monster: Reported 1992. It had a reptilian appearance. [This lake is in Washington state]
Morona Cocha Serpent: Reported 2009. This monstrous reptile is said to have dragged an island across this lake in Peru.
Long Lake Monsters: Reported 1883. Two monsters seen fighting in a river near this lake in North Dakota.
Lake Banyoles Monster: This lake in Spain has been said to harbor a monster since the 8th Century. There were reports of it in the 19th and early 20th Century. According to one report, it was seen crossing the road.
Island Lake Monster: Reported in this Michigan lake in 1955.
Lake Espantosa Monster: Reported 1887 and said to have dragged a woman into the lake. [This lake is in Texas]
Lake Titicaca Monster: Reported 1989. This famous lake in Bolivia was said to contain a huge-headed creature.