They could likely retrofit to do so but there'd be a lot of ecological concerns along with the infrastructure and energy cost of pumping billions of gallons of

They could likely retrofit to do so but there'd be a lot of ecological concerns along with the infrastructure and energy cost of pumping billions of gallons of water from sea level. Ecological concerns wouldn't just be pumping seawater into a large freshwater lake but questions of where to intake water, cross contact between the Atlantic and Pacific oceans there at a new location, etc. Not a trivial set of issues.