Halton Hills is a town in the Regional Municipality of Halton, located in the northwestern end of the Greater Toronto Area, Ontario, Canada with a population of 61,161 (2016).
There are many natural features within these bounds; they include the Niagara Escarpment, and the Bruce Trail. Many of these local features are protected by the Conservation Halton, Credit Valley Conservation & Grand River Conservation Authority.
Communities
The primary population centres are Georgetown and Acton. Additionally, there are a number of hamlets and rural clusters within the town, including Ashgrove, Ballinafad (straddling the boundary with Erin), Bannockburn, Crewsons Corners (straddling the boundary with Erin, Guelph-Eramosa and Milton), Glen Williams, Henderson's Corners, Hornby, Limehouse, Mansewood, Norval, Scotch Block, Silver Creek, Speyside, Stewarttown, Terra Cotta (straddling the boundary with Caledon), and Wildwood. The area was first settled in the 1820s.
Geography
Esquesing Township, of which the greatest part went to form Halton Hills, was favourably described in 1846:
The town is bisected by the Niagara Escarpment from southwest to northeast, and a significant portion of the rural area is located within the provincial Greenbelt. Above the Escarpment, a large proportion of the rural area is classified as environmentally sensitive wetlands, and there are several sites that are licensed for aggregate extraction, for which expansion requires detailed environmental assessment. Below the Escarpment, the rural area is mainly agricultural, with the exception of an industrial area currently being developed between Highway 401 and Steeles Avenue.
The town also forms part of three watersheds:
to the west of Acton, a small area flows toward the Grand River
the northern half flows into the Credit River, including the Black Creek and Silver Creek tributaries the southern half flows into the Sixteen Mile Creek
The Water Survey of Canada operates two hydrometric monitoring stations in the town, on the Black Creek below Acton, and at Norval on the Credit River.
Vegetation
Halton Hills is located in the transition zone between the Huron-Ontario Forest Section of the Great Lakes-St. Lawrence forest zone to the north and the Niagara Section of the Carolinian forest zone to the south. Both forest zones are part of the Mixedwood Plains Ecozone. The natural vegetation in the Huron-Ontario Section is dominated by mixed wood forests. It is a transitional type between the southern deciduous forests and the northern coniferous forests. The forest communities of the Niagara Section are dominated by broad-leaved trees. Overall, Halton Hills consists predominantly of agricultural lands with scattered woodlands and wetlands. The woodlands are mainly deciduous forest and the wetlands are either cedar swamp or cattail marsh.
Endangered and threatened species
American ginseng exists in the town, and is protected under the Endangered Species Act, 2007. Butternut trees are also threatened by the butternut canker. The hooded warbler and the Jefferson salamander are also designated as threatened species.
Brook trout had been eliminated from the Black Creek watershed for many years, following the ongoing environmental disaster due to the excessive consumption of faecal mater as well as the trailer park polluting the water in the town of Erin. The trout have not returned, and anglers report that most of the fish have almost entirely disappeared from the area.
Geology
The physiography and distribution of surface material in the Town of Halton Hills are the result of glacial activity which took place in the Late Wisconsinan Substage of the Pleistocene Epoch. This period of time, which lasted from approximately 23,000 to 10,000 years ago, was marked by the repeated advance and melting back of massive, continental ice sheets.
The Niagara Escarpment dominates the physiography of the town and greatly influenced the pattern of glaciation in the region. The Escarpment, formed by erosion over millions of years, is a high relief bedrock scarp which trends to the north through the central part of the town. To the west, on the upper surface of the Escarpment, hummocky morainic ridges deposited by glacial ice form part of the Horseshoe Moraines physiographic region. To the southeast below the Escarpment, is a smooth glacial till plain partially bevelled by lacustrine action, which forms part of the South Slope and Peel Plain physiographic regions.