Grand Harbor Resort & Waterpark  
350 Bell Street
Dubuque, IA 52001
563-690-4000
866-690-4006

This 25,000 square foot indoor waterpark features the Huck Finn II, which has a giant bucket that dumps nearly 800 gallons of water every nine minutes; water cannons, squirt guns, an inside/outside tube ride, a lazy river, pools, rope ladders, two giant hot tub whirlpools, water chutes, and many family-oriented aquatic activities.