Native American mythology of the western Great Basin has that a serpent lurks in the waters of the various lakes, whether it be Eagle, Pyramid or Tahoe. Some versions assert the lakes are connected by underground channel, and this is why sightings of the serpent are rare as the serpent is constantly traveling from lake to lake.
According to the Lassen Advocate of August 13, 1976: “Suspicions of a possible Loch Ness monster in Eagle Lake were aroused Tuesday, Aug. 10, at about dusk when a group of people apparently saw a mysterious creature twice surface near the Eagle Lake marina. According to Gene Moore of Hemet, California who was fishing from shore, it looked like a 15 to 20 foot creature that almost looked like a big eel.