W.J. Niederkorn Library 316 W Grand Ave, Port Washington, WI53074 Nestled on the hills of West Grand Avenue and North Webster Street, the W.J. Niederkorn Library can be accessed from…More both floors. The upper floor features adult books, reference materials and other types of media, while the entire bottom floor is dedicated to children's reading. This library is a busy place to be, with plenty of adult and youth activities planned each month, but visitors will easily browse the shelves in the calm and quiet considered typical of such an atmosphere.