Fluctuating Water Levels

Grenadier Pond
David Stoneleigh

In its natural state, the water level of Grenadier Pond was greatly influenced by its direct connection to Lake Ontario, which typically fluctuates a metre or more over the course of a year. Today, water from the pond flows through an outflow weir at the southwest corner of Grenadier Pond into the Humber River and Lake Ontario.

To re-establish a more natural water level regime, the outflow weir was modified in 1996 so that the water level can be lowered during the late summer and early fall to stimulate the growth of aquatic plants near the shoreline, and raised in the spring to provide flooded edge habitat for spawning fish.

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Content last modified on September 28, 2010, at 02:00 PM EST