639.5' - Water begins to go over the protective earthen dikes. <br><br>639' - Water begins to flow over the lock walls at Dam 8. <br><br>638.4' - Water levels reach the flood of record. <br><br>636' - Lock and dam 8 is closed to navigation. <br><br>631.5' - Blackhawk Park south of Genoa is flooded.<br><br>625.2' - Army Road likely closes near Albin, Iowa impacting the public access.<br><br>