At the end of the last ice age, over 10,000 years ago, the rapid draining of Glacial Lake Regina eroded a large channel that is now occupied by the much smaller contemporary Souris River. Also, much of the drainage basin is fertile silt and clay deposited by another former glacial lake, Lake Souris.

Flow rates and flood potential

During the period from 1930 to 1941 severe drought conditions prevailed and PFRA

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