According to Ojibwa oral tradition, these five Sauks were massacred by local Dakota Indians in the late 18th century.

[2] Osakis is a large prairie lake, with a surface area of 6,270 acres (25.4 km2) and a maximum depth of 73 feet (22 m).

Osakis is the primary source of the Sauk River, having a naturally occurring but now human-controlled outflow on the east side of the lake.

Osakis is an exceptional walleye lake; it has long been known as the "Mother Lake" because the Minnesota Department of Natural Resources uses a fishtrap on Bull Creek to obtain milt and eggs from walleyes for use in breeding and stocking programs.

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