Red River averages 5 inches per mile of length. In the region of Drayton-Pembina, the gradient is only 1.5 inches per mile. The water tends to pool in this area during flood season. The region can become a massive, shallow lake. See also Treaty of Old Crossing Pembina Region Portage Diversion Red River Floodway Notes External links RiverWatchOnline: Red River History Red River of the North Landforms of Manitoba Valleys of Minnesota Valleys of North Dakota Former regions and territories of the United States Regions of Minnesota Regions of North Dakota River valleys of Canada Midwestern United States River valleys of the United States