McKay Lake (formerly Hemlock Lake, McKay's Lake, or MacKay Lake) is a

meromictic lake A meromictic lake is a lake which has layers of water that do not intermix. In ordinary, holomictic lakes, at least once each year, there is a physical mixing of the surface and the deep waters. The term ''meromictic'' was coined by the Austria ...

located in the former Village of

Rockcliffe Park Rockcliffe Park ( French: ''Parc Rockcliffe'') is a neighbourhood in Rideau-Rockcliffe Ward, close to the centre of Ottawa, Ontario, Canada. Established in 1864, organized as a Police village in 1908, and an independent village from 1926, and u ...

Ottawa Ottawa is the capital city of Canada. It is located in the southern Ontario, southern portion of the province of Ontario, at the confluence of the Ottawa River and the Rideau River. Ottawa borders Gatineau, Gatineau, Quebec, and forms the cor ...

Ontario Ontario is the southernmost Provinces and territories of Canada, province of Canada. Located in Central Canada, Ontario is the Population of Canada by province and territory, country's most populous province. As of the 2021 Canadian census, it ...

, Canada. The lake is named for

Thomas McKay Thomas McKay (1 September 1792 – 9 October 1855) was a Canadian businessman who was one of the founders of the city of Ottawa, Ontario. Biography McKay was born in Perth, Scotland and became a skilled stonemason. He emigrated to the Cana ...

, one of the founders of Ottawa, who once owned all of Rockcliffe Park in the 19th century, including the lake. The lake was officially named McKay Lake in 1954 after Rockcliffe Park Village Council passed a by-law. Prior to that the lake often appeared on maps as "Hemlock Lake", but locals referred to it as McKay Lake. The lake was once a swimming hole. Today, the west side of the lake is privately owned and lined with mansions and a public path known as the "Dog Walk" (a closed portion of Lansdowne Road), while the east side of the lake is owned by the City of Ottawa and is home to the Caldwell-Carver Conservation Area. Today, public swimming is banned in the lake due to its "oozy/squishy/mushy" bottom. The lake is drained by an intermittent stream that travels north into the

Ottawa River The Ottawa River (, ) is a river in the Canadian provinces of Ontario and Quebec. It is named after the Algonquin word "to trade", as it was the major trade route of Eastern Canada at the time. For most of its length, it defines the border betw ...

. Its watershed includes the nearby Beechwood Cemetery and the next-door Sand Pits Lake, better known as "The Pond". The lake is fed by an intermittent stream that flows into the lake from the southeast.

Geology

The lake originated about 9000 years ago as a

plunge pool A plunge pool (or plunge basin or waterfall lake) is a deep depression in a stream bed at the base of a waterfall or Shut-in (river), shut-in. It is created by the erosion, erosional forces of cascading water on the rocks at the formation's bas ...

along a narrow channel between escarpments which are now Rockcliffe Park (the park north of the lake) and Beechwood Cemetery. Strong currents and eddies over the escarpments eroded the marine clay, exhuming a pre-existing glaciofluvial deposit, causing the lake to form.

Clay Clay is a type of fine-grained natural soil material containing clay minerals (hydrous aluminium phyllosilicates, e.g. kaolinite, ). Most pure clay minerals are white or light-coloured, but natural clays show a variety of colours from impuriti ...

deposits at least 5 metres thick from the Last Glacial Period underlies the northern, eastern and southern boundaries of the lake. The lake also contains deposits of gravel, gritty sand, lacustrine sand and

marl Marl is an earthy material rich in carbonate minerals, Clay minerals, clays, and silt. When Lithification, hardened into rock, this becomes marlstone. It is formed in marine or freshwater environments, often through the activities of algae. M ...

Flora and fauna

Established trees that line the lake include the trembling aspen,

balsam poplar ''Populus balsamifera'', commonly called balsam poplar, bam, bamtree, eastern balsam-poplar, hackmatack, tacamahac poplar, tacamahaca, is a tree species in the balsam poplar species group in the poplar genus, ''Populus.'' The genus name ''Populus ...

, as well as planted white pines,

tamarack ''Larix laricina'', commonly known as the tamarack, hackmatack, eastern larch, black larch, red larch, or American larch, is a species of larch native to Canada, from eastern Yukon and Inuvik, Northwest Territories east to Newfoundland, and als ...

birch A birch is a thin-leaved deciduous hardwood tree of the genus ''Betula'' (), in the family Betulaceae, which also includes alders, hazels, and hornbeams. It is closely related to the beech- oak family Fagaceae. The genus ''Betula'' contains 3 ...

, hawthorns,

sumac Sumac or sumach ( , )—not to be confused with poison sumac—is any of the roughly 35 species of flowering plants in the genus ''Rhus'' (and related genera) of the cashew and mango tree family, Anacardiaceae. However, it is '' Rhus coriaria ...

red-osier dogwood ''Cornus sericea'', the red osier or red-osier dogwood, is a species of flowering plant in the family (biology), family Cornaceae, native to much of North America. It has sometimes been considered a synonym of the Asian species ''Cornus alba''. ...

and

white spruce White spruce is a common name for several species of spruce (''Picea'') and may refer to: * '' Picea engelmannii'', native to the Rocky Mountains and Cascade Mountains of the United States and Canada * ''Picea glauca ''Picea glauca'', the whi ...

. Other common trees include the Manitoba maple,

red maple ''Acer rubrum'', the red maple, also known as swamp maple, water maple, or soft maple, is one of the most common and widespread deciduous trees of eastern and central North America. The U.S. Forest Service recognizes it as the most abundant nati ...

sugar maple ''Acer saccharum'', the sugar maple, is a species of flowering plant in the soapberry and lychee family Sapindaceae. It is native to the hardwood forests of eastern Canada and the eastern United States. Sugar maple is best known for being the ...

, white elm,

basswood ''Tilia americana'' is a species of tree in the family Malvaceae, native to eastern North America, from southeast Manitoba east to New Brunswick, southwest to northeast Oklahoma, southeast to South Carolina, and west along the Niobrara River to ...

and

bur oak ''Quercus macrocarpa'', the bur oak or burr oak, is a species of oak tree native to eastern North America. It is in the white oak section, ''Quercus'' sect. ''Quercus'', and is also called mossycup oak, mossycup white oak, blue oak, or scrub ...

. The

Norway maple ''Acer platanoides'', commonly known as the Norway maple, is a species of maple native to eastern and central Europe and western Asia, from Spain east to Russia, north to southern Scandinavia and southeast to northern Iran. It was introduced to ...

is an invasive species in the area. The south and east sides of the lake is home to wetland marshes, which is home to ''

Scirpus ''Scirpus'' is a genus of grass-like species in the sedge family Cyperaceae many with the common names club-rush, wood club-rush or bulrush. They mostly inhabit wetlands and damp locations. Description ''Scirpus'' are rhizomatous perennial herbs ...

'', common cattails and pockets of pickerelweed with royal ferns, sensitive ferns and

speckled alder ''Alnus incana'', the grey alder, tag alder or speckled alder, is a species of multi-stemmed, shrubby tree in the birch family, with a wide range across the cooler parts of the Northern Hemisphere. Tolerant of wetter soils, it can slowly spread w ...

along the shoreline. Other species include marsh fern and swamp milkweed, glossy buckthorn and common buckthorn. Aquatic plants include

water milfoil ''Myriophyllum'' (water milfoil) is a genus of about 69 species of freshwater aquatic plants, with a cosmopolitan distribution. The centre of diversity for ''Myriophyllum'' is Australia with 43 recognized species (37 endemic). These submersed aq ...

, yellow pond-lily, lesser duckweed, greater bladderwort and

purple loosestrife ''Lythrum salicaria'' or purple loosestrifeFlora of NW Europe''Lythrum salicaria'' is a flowering plant belonging to the family Lythraceae. It should not be confused with other plants sharing the name loosestrife that are members of the family Pr ...

. Animals that use the lake include

muskrat The muskrat or common muskrat (''Ondatra zibethicus'') is a medium-sized semiaquatic rodent native to North America and an introduced species in parts of Europe, Asia, and South America. The muskrat is found in wetlands over various climates ...

snapping turtles The Chelydridae is a Family (biology), family of turtles that has seven extinct and two extant genera. The extant genera are the snapping turtles, ''Chelydra'' and ''Macrochelys''. Both are Endemic (ecology), endemic to the Western Hemisphere. Th ...

, painted turtles, several species of

heron Herons are long-legged, long-necked, freshwater and coastal birds in the family Ardeidae, with 75 recognised species, some of which are referred to as egrets or bitterns rather than herons. Members of the genus ''Botaurus'' are referred to as bi ...

s and

kingfisher Kingfishers are a family, the Alcedinidae, of small to medium-sized, brightly coloured birds in the order Coraciiformes. They have a cosmopolitan distribution, with most species living in the tropical regions of Africa, Asia, and Oceania, ...

s. Historically, the lake was home to

otter Otters are carnivorous mammals in the subfamily Lutrinae. The 13 extant otter species are all semiaquatic, aquatic, or marine. Lutrinae is a branch of the Mustelidae family, which includes weasels, badgers, mink, and wolverines, among ...

s and

mink Mink are dark-colored, semiaquatic, carnivorous mammals of the genera ''Neogale'' and '' Mustela'' and part of the family Mustelidae, which also includes weasels, otters, and ferrets. There are two extant species referred to as "mink": the A ...

. Small

brown bullhead The brown bullhead (''Ameiurus nebulosus'') is a fish of the family Ictaluridae that is widely distributed in North America. It is a species of bullhead catfish and is similar to the black bullhead (''Ameiurus melas'') and yellow bullhead (' ...

fish are common, as well as shiners, sunfish,

pumpkinseed The pumpkinseed (''Lepomis gibbosus''), also referred to as sun perch, pond perch, common sunfish, punkie, sunfish, sunny, and kivver, is a small to medium–sized freshwater fish of the genus ''Lepomis'' (true sunfishes), from the sunfish fami ...

common carp The common carp (''Cyprinus carpio''), also known as European carp, Eurasian carp, or simply carp, is a widespread freshwater fish of eutrophic waters in lakes and large rivers in Europe and Asia.Fishbase''Cyprinus carpio'' Linnaeus, 1758/ref>Ark ...

goldfish The goldfish (''Carassius auratus'') is a freshwater fish in the family Cyprinidae of the order Cypriniformes. It is commonly kept as a pet in indoor aquariums, and is one of the most popular aquarium fish. Goldfish released into the w ...

and

largemouth bass The largemouth bass (''Micropterus nigricans'') is a carnivorous, freshwater fish, freshwater, ray-finned fish in the Centrarchidae (sunfish) family, native to the eastern United States, eastern and central United States, southeastern Canada an ...

. Less common in the lake are

mussels Mussel () is the common name used for members of several families of bivalve molluscs, from saltwater and freshwater habitats. These groups have in common a shell whose outline is elongated and asymmetrical compared with other edible clams, whic ...

and

crayfish Crayfish are freshwater crustaceans belonging to the infraorder Astacidea, which also contains lobsters. Taxonomically, they are members of the superfamilies Astacoidea and Parastacoidea. They breathe through feather-like gills. Some spe ...

History

Swimming was popular in the lake in the 19th century and early 20th century. The lake was also used for herds of cattle to drink from in the 19th century. Pollution caused a temporary ban to swimming in 1949. In 1954, hundreds of dead fish caused by a "strange malady" were found covering the shore of the lake. Beginning in 1963, the lake was the site of the dumping of fill into the marsh of the lake, which was followed by major landfill activity in 1968, blamed on Rockcliffe Park Realty Ltd., who had been hauling fill from the defunct Eastview Dump, which was being excavated to build a home for the aged. Dumping material was of a "soggy nature and had an offensive odor" (sic), and "contained broken bottles, old tin cans, car mufflers, old washing machines and rubber tires". Initially a dumping permit was granted by the Rockcliffe Park Village Council, however they passed a by-law in 1969 banning dumping into the lake. However, more dumping activity picked up in 1972, dumping was halted under orders of the ''Ontario Environmental Protection Act''. The land around the lake was sold in 1980, allowing for the Village of

to take over the area, in exchange for permitting land east of The Pond to be developed into condominiums. The area around the lake was designated as a "Conservation zone" by the then-Village of Rockcliffe Park in 1993. The west side of the lake was the site of major storm sewer project in 1996, which was followed a revegetation plan. The Village officially designated the area as a "Heritage Conservation District" under the ''

Ontario Heritage Act The ''Ontario Heritage Act'', (the ''Act'') first enacted on March 5, 1975, allows municipalities and the provincial government to designate individual properties and districts in the Canadian Province of Ontario, as being of cultural heritage ...

'' in 1997.

References

External links

{{Commons category-inline Landforms of Ottawa Lakes of Ontario Meromictic lakes