People may have noticed the lazy river and slides at the Marshalltown Family Aquatic Center have been shut down. Hart says they have already ordered the part to get it fixedThe last day that the Marshalltown Family Aquatic Center will be open is August 16th. This summer the pool has been closed on Wednesdays due to budget issues. Their hours are 1-7pm during the week and 1-6pm on the weekends. Water Walking happens at 11:30am each day the pool is open.