I support the Great Lakes too. Grew up a ½ mile from Lake Erie and for 3 years practically next to the Niagara River about 6 miles from Lake Ontario. The part of the OP article that drew my attention wasn't about their depth but rather:
Most of the attention on Trump's remarks about the lakes focused on his budget proposal. Trump said that he supported “full funding” for the Great Lakes Restoration Initiative — despite his administration calling for slashing funding by 90 percent.
“And I'm going to get, in honor of my friends, full funding of $300 million for the Great Lakes Restoration Initiative,” the president said.
His 2020 fiscal budget proposal calls for a $270 million cut to the $300 million Great Lakes Restoration Initiative, according to The Detroit Free Press.