Historic Sites of Manitoba: Glacial Lake Agassiz Plaque (Birch River Wayside Park, RM of Mountain)

A plaque in the Birch River Wayside Park, in the Rural Municipality of Mountain, was erected by the Manitoba Heritage Council. It commemorates glacial Lake Agassiz.

Glacial Lake Agassiz was formed 11,500 years ago from the meltwaters of a massive ice sheet that had previously covered all of Manitoba. At its maximum, the lake was larger than any other on the continent, covering in total more than 500,000 square kilometres of Manitoba, Saskatchewan, Ontario, North Dakota, and Minnesota. During its 4,500-year history, Lake Agassiz rose and fell several times with advances and retreats of the glacial and the opening and closing of various drainage channels. Whenever the lake stabilized for a time, waves created low cliffs and beach ridges which are still visible.

The beaches figured prominently in the lives of Manitoba’s Aboriginal peoples. Elevated and well-drained, these landforms served as campsites, lookouts for sighting game, burial grounds, travel routes between seasonal camps, and sources of stone to fashion tools. Glacial Lake Agassiz played a central role in the shaping of Manitoba’s topography and human history.

Glacial Lake Agassiz Plaque

Glacial Lake Agassiz Plaque (July 2014)
Source: Alan Mason

Site Coordinates (lat/long): N52.39822, W101.12175
denoted by symbol on the map above

See also:

Historic Sites of Manitoba: Glacial Lake Agassiz Plaque (Arden, Municipality of Glenella-Lansdowne)


This page was prepared by Alan Mason and Gordon Goldsborough.

Page revised: 19 April 2021

Historic Sites of Manitoba

This is a collection of historic sites in Manitoba compiled by the Manitoba Historical Society. The information is offered for historical interest only.

Browse lists of:
Museums/Archives | Buildings | Monuments | Cemeteries | Locations | Other

Inclusion in this collection does not confer special status or protection. Official heritage designation may only come from municipal, provincial, or federal governments. Some sites are on private property and permission to visit must be secured from the owner.

Site information is provided by the Manitoba Historical Society as a free public service only for non-commercial purposes.

Send corrections and additions to this page
to the MHS Webmaster at webmaster@mhs.mb.ca.

Search Tips | Suggest an Historic Site | FAQ

Help us keep history alive!