The evil serpent Meshekenabek carried off Manobozho's cousin into a deep lake. Manobozho caused the sun to shine fiercely on the lake to drive out Meshekenabek and his companions. When they emerged, Manobozho shot an arrow into the serpent's heart. The serpent, in his dying rage, stirred up the waters of the lake and spread waves over the land. Fleeing, Manobozho warned the Indians also to retreat to a mountain top. The waters still rose, though, and Manobozho made a raft for them to take refuge on. However, Manobozho couldn't disperse the flood without some earth to use as a nucleus. Muskrat finally succeeded in diving for some dirt, and Manobozho used it to make the waters receed. [Howey]
or
References: Howey, M. Oldfield. The Encircled Serpent, Arthur Richmond Company, New York, 1955.