This museum shows off the diversity of life both in and along the mighty Mississippi River. The aquarium features several tanks filled with fish that call the river home. There is also a riverboat available to tour, as well as several interactive exhibits for both adults and kids.There is even a 4-D theater added as part of a recent expansion.
If you go:
Admission is $15 for Adults, with discounts for Seniors, Kids, and those visiting other Dubuque Museums. (Check their web site for current pricing).
Links:

350 East 3rd Street
Port of Dubuque
Dubuque, Iowa 52001 USA
info@rivermuseum.com
Phone Numbers:
Information -- Toll Free
+1 (800) 226-3369
+1 (800) 226-3369
Information
+1 (563) 226-3369
+1 (563) 226-3369