Trails around portages in North America usually began as animal tracks and were improved by tramping or blazing. In a few places iron-plated wooden rails were laid to take a handcart. Heavily used routes sometimes evolved into roads when sledges, rollers or oxen were used, as at Methye Portage. Sometimes railways were built (Champlain and St. Lawrence Railroad). The basic purpose of most canals is to avoid portages.
Places where portaging occurred often became temporary and then permanent settlements (such as Hull, Quebec; Sault Ste. Marie, Ontario; New Orleans, Louisiana; and Chicago, Illinois). The importance of free passage through portages found them included in laws and treaties. The Northwest Ordinance says "The navigable waters leading into the Mississippi and St. Lawrence, and the carrying places between the same, shall be common highways and forever free, as well to the inhabitants of the said territory as to the citizens of the United States..." The Treaty of Greenville between the U.S. and the Indian tribes of the area includes: "And the said Indian tribes will allow to the people of the United States a free passage by land and by water, as one and the other shall be found convenient, through their country,..." Then four portages are mentioned specifically. Portages are also used in the treaty to set boundaries ("The general boundary line between the lands of the United States and the lands of the said Indian tribes, shall begin at the mouth of Cayahoga river, and run thence up the same to the portage..."). One historically important fur trade portage is now Grand Portage National Monument. Recreational canoeing routes often include portages between lakes, for example, the Seven Carries route in Adirondack Park. Algonquin Park, Boundary Waters Canoe Area Wilderness and Sylvania Wilderness have famous portage routes.
Numerous portages were upgraded to carriageways and railways due to their economic importance. The Niagara Portage had a gravity railway in the 1760s. The passage between the Chicago and Des Plaines Rivers (and so between the Great Lakes and the Mississippi River systems) was through a short swamp portage which seasonally flooded and it is thought that a channel gradually developed unintentionally from the dragging of the boat bottoms. The 1835 Champlain and St. Lawrence Railroad connected the cities of New York and Montreal without needing to go through the Atlantic. The passage between Lake Superior and Lake Huron was by a portage dragway of greased rails with capstans until a railway was built in 1850 and a canal in 1855. The 5-mile-long Nosbonsing and Nipissing Railway was built just to carry logs between lakes on their way to the sawmill. Allegheny Portage Railroad and Morris Canal both used canal inclined planes to pass loaded boats through portages.
Portages in North America Wikipedia
Sometimes the settlements were named for being on a portage. Some places in the United States and Canada so named are:Cranberry Portage, Manitoba
Giscome Portage, British Columbia
Grand Portage, Minnesota
Portage, Nova Scotia
Portage Bay, Washington
Portage County, Ohio
Portage County, Wisconsin
Portage Park, Chicago
Portage la Prairie, Manitoba (portage between the Assiniboine River and Lake Manitoba)
Rat Portage, Ontario
Seton Portage, British Columbia
Bayou Portage, Louisiana
Names with portage appear on various other geographical features, including road and lakes, as in Portage Lake. In Hull, Quebec a major street is named promenade du Portage as the city is the head of uninterrupted navigation from Montréal on the Ottawa River and one must portage around the Chaudière Rapids.