Of which river is the body of water, that marks the change from Grand Street to Grand Avenue, a tributary ?
Grand Street and Grand Avenue:  Originating in Williamsburg, Brooklyn, Grand Street runs roughly northeast until crossing Newtown Creek into Queens, whereupon Grand Street becomes Grand Avenue, continuing through Maspeth where it is a main shopping street, until reaching its northern end at Queens Boulevard in Elmhurst. Newtown Creek: Newtown Creek, a 3.5 mi long tributary of the East River, is an estuary that forms part of the border between the boroughs of Brooklyn and Queens, in New York City.
East River,