 The Town of Richmond Hill contains the headwaters and tributaries of three watershed systems, the Humber River, Rouge River and Don River.
A watershed is the land area that drains water to a particular stream, river, or lake. It is a land feature that can be identified by tracing a line along the highest elevations between two areas on a map, often a ridge.
The East Humber subwatershed begins on the Oak Ridges Moraine, in the kettle lakes of St. George and Wilcox in the north end of Richmond Hill. The portion of Richmond Hill within the Humber watershed also contains the Town's widest variety of wildlife, as it is home to a diverse array of amphibians, birds and fish.
The Upper East Don subwatershed of the Don River runs down the west side of the Town encompassing mainly older portions of settlement in Richmond Hill.
The Rouge River watershed covers the largest section of Richmond Hill with both headwaters and middle reach areas of the West Rouge Tributary and Beaver Creek Tributary. The Jefferson Forest and its well known Species at Risk -- the Jefferson Salamander -- are possibly the most significant features within this watershed.
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