Lake Scugog on a cloudy day.
|Location||Durham Region & Kawartha Lakes, Ontario|
|Part of||Great Lakes Basin|
|Primary inflows||Nonquon River, Blackstock Creek, Cawkers Creek|
|Primary outflows||Scugog River|
|Catchment area||529 square kilometres (204 sq mi)|
|Surface area||68 square kilometres (26 sq mi)|
|Average depth||1.4 metres (4 ft 7 in)|
|Max. depth||7.6 metres (24 ft 11 in)|
|Water volume||0.0957 cubic kilometres (0.0230 cu mi)|
|Shore length1||172 kilometres (107 mi)|
|Surface elevation||249.9 metres (819 ft 11 in)|
|Settlements||Port Perry, Lindsay|
|1 Shore length is not a well-defined measure.|
Lake Scugog is an artificially flooded lake in Scugog, Regional Municipality of Durham and the unitary city of Kawartha Lakes in central Ontario, Canada. It lies between the communities of Port Perry and Lindsay. The lake has been raised and lowered several times over its history. Though not technically part of the Kawartha lakes due to its shallow depths, it is often geographically linked to them. Its sole outflow, the Scugog River, connects to Sturgeon Lake. Lake Scugog is in the Great Lakes Basin and forms part of the Trent–Severn Waterway.
The name "Scugog" may be an Ojibwe word meaning "marshy waters". However, according to Place Names of Ontario by Alan Rayburn, Scugog is a Mississauga word meaning 'waves leap over a canoe' in reference, perhaps, to the flooding of the river valley, or, more likely, the quickness that waves can be whipped up in winds, owing to its shallowness.
With 68 km² with an average depth of 1.4 metres, Lake Scugog is amongst the largest five lakes of the Kawarthas by surface area. It is also the shallowest, alongside Mitchell Lake It is fed by the Blackstock and Cawkers Creeks and the Nonquon River, as well as by many small unnamed tributaries. The Scugog River is the only outflow from the lake, flowing into Sturgeon Lake which drains through the Trent watershed. Other communities surrounding the lake include Seagrave, Port Perry, View Lake and Caesarea. Scugog Island (whose island status is debatable due to the south-western edge being a seasonally flooded swamp) lay in the centre of the lake.
A 2.58 km2 (1.00 sq mi) Mississaugian Indian Reserve of about 50 residents exists on Scugog Island, and includes the Great Blue Heron Casino, amongst the many seasonal cottagers on the island and around the lake.
It is a hard-water marl-producing lake, and the lake bottom consists of deep deposits of it. This gives the lake a murky appearance in warm weather, especially during the summer. The lake is reportedly filling in with this marl by about 1 millimetre per year.
In dry summer weather, the Scugog River ceases to flow out of the lake, and its tributary streams of Mariposa Brook and East Cross Creek flow backward into the lake via the river to offset the high evaporative losses off the lake and marsh surfaces.
The lake has had a history of water level changes. Originally, it was essentially two lakes connected via a broad channel flowing through a marshy area along the north end. Prior to the dam and flooding much of area was forest and swamp land. The lake was flooded approximately ten feet when William Purdy and his sons dammed the Scugog River at Lindsay (Upstream from the current dam and locks) in 1834 to power his grist mill. During this period of high water levels through the mid-thirties, today's so-called islands of Washburn, Nonquon (now Seven Mile), Ball, Platten, and the enormous centrally located Scugog came into existence as islands. Today, these form part of the mainland, with the exception of Scugog Island, which is generally maintained as an island by man-made channels around the swampy south end of the island.
The stagnant waters of the lake caused a wave of deadly fevers in the surrounding farms, and the new lake limits quickly became very unpopular with the local residents. On one day in the summer of 1838, settlers from the countryside surrounding the lake rose up and using axes, flintlocks and pitchforks, tore the dam apart, lowering the lake once more. No charges were laid due to the general anger towards the water height by residents, and because of a deal reached between Purdy and the Board of Works of the Province of Canada, on December 18, 1843. Mr. Purdy was forced to lower the elevation to something approximating its natural maximum spring high-water level, a reduction in the height of the previous dam by about three feet. The Board of Works constructed the dam and a lock for navigation into Lake Scugog, which was completed in 1844 and included a log flume. In exchange, Purdy relinquished all claims against the damage done by residents, and maintained the dam and flume.
The original body of water consisted of the upper sections of the current lake and was more ideally a shallow marsh than an actually lake.
Lake Scugog has an array of fish, including an abundant supply of largemouth bass, walleye, crappie, musky, perch, carp, catfish, rock bass, smallmouth bass and minnows. Due to a dwindling walleye population, there is no season to catch or keep walleye. it is a renowned fishing location in southern Ontario.
Like many of the lakes of southern Ontario, Scugog served for a time as a vessel for transporting logs downstream to Trenton in the early nineteenth century. This resource became quickly exhausted with the rapid sawing of pine in the area. The Trent Canal (Now the Trent-Severn Waterway) was constructed through Lindsay in late 1800s to facilitate steamboat travel to Sturgeon Lake and Lake Ontario as the boats were constructed in Port Perry.
Today, the lake is a tourist area, forming the southern boundary to "Cottage Country". The towns of Port Perry and Lindsay benefit from the recreational boating through the Trent-Severn Waterway by vacationers in the summer. Fishing is also a major attraction of the lake, as its shallow weed-filled bed is host to an abundance of species.
In June 2007, waterfront residents and boaters on Lake Scugog were finding that carp had begun dying. Residents around the lake were finding massive numbers of dead carp floating and landing on shore. The Carp were dying from an unknown cause. The smell of rotting fish was everywhere. The local authorities allowed dead Carp pick-up days to keep the smell down. After MNR testing, it was suspected that the bacteria columnaris was one of the causes of this massive carp massacre. However, the Koi herpes virus, an introduced disease affecting the carp family, was ultimately determined to be the culprit.   Few carp deaths have occurred since, and in 2008, it was reported that the Lake had returned to its normal state.
A list of rivers feeding to and from the lake:
- Nonquon River - flow from the northwest end of the Lake beginning from Seagrave and heads in a southwest direction towards Utica
- Cawkers Creek - flow from southwest end of Port Perry southwards for 16 km
- Mariposa Brook - also known as Big Creek, Black Creek, Davidson's Creek, and West Cross Creek begins in swamps near Manilla then flows northeast to then south past Little Britain and then east to empty into the Scugog River at Ops
- Blackstock Creek - found southeast of Lake Scugog between the Lake Scugog and East Cross Creek
- Scugog River
The marsh on the lake along the Port Perry Causeway south of Port Perry, Ontario is named for Henry Smith Osler, whom was one of the earlier owners of land which contains the marshes. The current marsh area covers 417 hectares (41,700 a) of wetlands.
- "Lake Scugog". Geographical Names Data Base. Natural Resources Canada. Retrieved 2015-02-09.
- "Trent Watershed Study (topography and drainage map)" (PDF). Retrieved 2009-07-30.
- "Statistics Canada 2001 Census Community Profiles, Mississaugas of Scugog Island". 2001. Retrieved 2009-07-30.
- Kirkconnell, Watson (1967), County of Victoria, Centennial History, Victoria County Council, p. 30, retrieved 2009-07-30
- Kirkconnell, Watson (1967), County of Victoria, Centennial History, Victoria County Council, p. 31, retrieved 2009-07-30
- Kirkconnell, Watson (1967), County of Victoria, Centennial History, Victoria County Council, p. 32, retrieved 2009-07-30
- "The Fishing Guide - Lake Scugog". Retrieved 2009-07-30.
- Kirkconnell, Watson (1967), County of Victoria, Centennial History, Victoria County Council, pp. 30–33, retrieved 2009-07-30
- citynews.ca (June 16, 2007), Fish Mystery Worries Those Living On Lake Scugog, Citytv Toronto, retrieved 2009-07-30
- Canadian Press (July 12, 2007), Officials alarmed over dead carp in Ontario, CTV News Toronto, retrieved 2009-07-30
- Royson James (May 10, 2008), Medicine to fix ailing Lake Scugog, The Toronto Star, retrieved 2009-07-30