The basin is drained by seven major streams and has a total relief of 1,900 feet (580 m).

Several efforts have been made to control lake levels in the last century.

In 1964, the Mossy River Dam was constructed at Terin's Landing at the outlet of the lake.

The ten bay concrete stoplog structure complete with a fish ladder is operated by the Province of Manitoba.

For example, a four-day rain in June 1947 produced an estimated peak inflow of 60,000 cubic feet per second (1,700 m3/s).