Can cockroaches come through the drains?
Yes. Adult cockroaches can fit in a space the size of the tip of a quarter and a baby can fit in a space the size of the tip of a dime. A roach can also stay under water for 40-45 minutes.
Lake Superior drains into Lake Huron through the St Marys River. Lake Michigan drains into Lake Huron through the Straits of Michilimackinac. Lake Huron drains into Lake Erie through the St Clair River, Lake St Clair, and the Detroit River. Lake Erie drains into Lake Ontario through the Niagara River. And Lake Ontario drains into the Atlantic Ocean through the St Lawrence River.