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
Hatherton Canal re-aligned canal. In 2006, the engineers Arup produced a feasibility study for a replacement route for the destroyed section which would link to Grove Basin on the Cannock Extension Canal. Environmental concerns led to a second feasibility study being produced by Atkins in 2009, for a route which connected to the derelict Lord Hayes Branch on the Wyrley and Essington Canal. A short section near the junction with the Staffordshire and Worcestershire Canal is navigable, and the cost of restoring the rest and building the new route to the Wyrley and Essington was estimated at £44.1 million in 2009. The