Lake Saint Pierre

Approximately 12,500 years ago, the retreat of the glaciers at the end of the last ice age resulted in a vast basin filled by the Champlain Sea. This sea extended from the city of Quebec to the east, and covered the Lower Mauricie, the Lower Laurentians, the lower part of the Ottawa Valley, Lake Ontario on the western side, and Lake Champlain USA) on the South side. The outline of the Champlain Sea is marked by ancient sandy shores where sand pits have been exploited. The water level has dropped some 8,000 years ago. The surface area of the watershed is 990,000 km² (380,000 sq mi) (equivalent to more than 60% of the surface area of Quebec). 58% of the catchment area is located in the United States, 28% in Ontario and only 14% in Quebec (2.5% in direct tributaries, 0.07% in the littoral zone). Lake Saint-Pierre is linked to 11 administrative regions, 58 RCMs and 654 municipalities.[4]

The lake is located in the Regional County Municipalities of Nicolet-Yamaska, Maskinongé, D'Autray, and Pierre-De Saurel, in addition to the city of Trois-Rivières. The shores of the lake affect several municipalities:

• North shore: Berthierville, Maskinongé, Louiseville, Yamachiche and Trois-Rivières (Pointe-du-Lac sector)
• South shore: Saint-Joseph-de-Sorel, Pierreville, Baie-du-Febvre and Nicolet.

Lake Saint-Pierre is fed by the St. Lawrence River (coming from the southwest) and the 14 main tributaries:

• North bank (from the mouth): Maskinongé River, Rivière du Loup, Yamachiche River, Glaises Stream, Sable River
• South bank (from the mouth): Yamaska River, Saint-François River, Colbert River, Landroche River, Des Frères River, Brielle River, Lemire River, Camille-Roy River, Nicolet River

The average depth of the lake is only three meters.[5] The channel of the seaway that has been dredged has a maximum depth of 11.3 m.

The lake was named by Samuel de Champlain following its passage on 29 June 1603, the day of the Saint-Pierre. The Abenaki call Lake Nebesek, which means at lac.[6] Jacques Cartier, during his second voyage to Canada in 1535, had given it the name of "Angoulême".

This seasonally-flooded area is an important stopping point for hundreds of thousands of migrating waterfowl. It is also an important nesting area for herons: more have been counted here than in any other place in North America. In 1998, it was recognized as a wetland of international significance under the Ramsar Convention.

The wildlife experts have identified 23 species of mammals around Lake Saint-Pierre, one of the most abundant species is the muskrat (Ondatra zibethicus), which is found in abundance in the lake.[7]

Being the last freshwater basin of the St. Lawrence River and its geographical position, Lake Saint-Pierre has marked the history of French Canada in terms of the fishing industry, hunting, transportation including the St. Lawrence Seaway, pleasure boating, the settlement of surrounding lands, winter ice roads and ferries.

Samuel de Champlain wrote, in 1609: "On the south side, there are two rivers, one called the" Rivière du Pont (Nicolet) and the other of Gennes (Saint-François or Yamaska), which are very beautiful and in beautiful and good country. "

Since the 1970s, the water quality of Lake Saint-Pierre has improved significantly, thanks to governmental requirements, such as:

• construction upstream of discharged water filtration centres, including those of municipalities/cities and those of industries;
• cleaning the banks and bed of the river, by municipalities/cities, organizations, businesses and riparian owners;
• revision of the composition of many manufactured products, thus reducing harmful emissions into the environment;
• implantation by riparian owners of regulated septic tanks;
• prohibition of discharge of waste water by boaters and commercial vessels;
• increased recycling of domestic and industrial waste, reducing the dumping of waste in nature;
• enhanced surveillance of water activities (e.g. Canadian Coast Guard, Environment Ministry, Municipalities/Cities).

The traffic on the river is a significant generator of shoreline erosion due to the waves produced, especially by large vessels using the St. Lawrence Seaway.[11] The seaway has changed the course of the natural flow of the river. In places, the flow distribution in the lake due to some stagnation of water near the banks, creating a silting.

In the area of Nicolet, the bed of the lake bottom contains an undetermined number of unexploded warheads from the centre of military fire which was in operation from the 1950s to the 2000s.

Throughout history, Lake St. Pierre has been the site of:

• Large disasters: flooding due to spring floods (usually from the beginning of April up to mid-May, sometimes until the end of May) often increased by tides,[12] often sudden windstorms causing high waves, spring debacles, icebreaking on winter roads on the water ... These forces of nature have often resulted in damage to waterfront facilities, equipment (such as fishing equipment), buildings and boats. Sometimes debris drift (fishing huts, docks, craft ...);
• Major tragedies: sinking, drowning, hunting or fishing accidents, people in perdition or drifting on the ice ...

In the days when wood was being transported by the flow of rivers, lost wood logs floated on Lake Saint-Pierre, detached themselves from the wooden cords during the floods, or escaped from the booms on the rivers adjacent (or upstream). These floating balls occasionally caused breakage to the boats. Sometimes, chores were organized to recover them.

On the north shore, between Maskinongé and Pointe-du-Lac, Highway 40 is a jetty protecting the land from rising or storm surges, at high tide or during major floods. Some flooding is causing a significant increase in the area of Lake Saint-Pierre. The flood waters of April and May 2017 were particularly disastrous on the shores.

• Lac Saint-Pierre is the setting of the poem, folk ballad, and animated short, "the Wreck of the Julie Plante", by William Henry Drummond.
• It is not the lake sought after by Duddy Kravitz in The Apprenticeship of Duddy Kravitz by Mordecai Richler. The lake in this book is clearly in walking distance of Lac des Sables.

• Saint Lawrence Lowlands
• Archipelago of Saint-Pierre Lake

Wikimedia Commons has media related to Lac Saint-Pierre.

• "Information sheet on Ramsar Wetlands: Lac Saint-Pierre" (PDF). Archived from the original (PDF) on 4 June 2011. (182 KB)
• Lac Saint Pierre Biosphere Reserve, Canada (UNESCO site)