Great Lakes are estimated at 900 trillion. The influx of parasitic lamprey populations after the development of the Erie Canal and the much later Welland Canal led to the two federal governments of the US and Canada working on joint proposals to control it. By the mid-1950s, the lake trout populations of Lakes Michigan and Huron were reduced, with the lamprey deemed largely to blame. This led to the launch of the bi-national Great Lakes Fishery Commission. "The Great Lakes: An Environmental Atlas and Resource Book" (1972) noted: "Only pockets remain of the once large commercial fishery." But, water quality improvements realized
Canal Age Mohawk and Lake Ontario), but the company proved that private financing was insufficient. George Washington led a partly enduring effort to turn the Potomac River into a navigable link to the west, sinking substantial energy and capital into the Patowmack Canal from 1785 until his death fourteen years later. By 1788 Washington's Potomac Company was successful in constructing five locks which took boats past the Potomac Great Falls. The Chesapeake and Ohio Canal superseded the Potomac Canal in 1823. Christopher Colles (who was familiar with the Bridgewater Canal) surveyed the Mohawk Valley, and made a presentation to the New York