None.
♂ Dozer (transfer 2016-Nov-09)
♀ Takena (death 2016-Oct-24)
♂ Mitik (transfer 2016-Jan-11)
♂ Illiyak (death 2009-Jul-01)
♀ unknown (death 2006-Mar-05)
♀ stillborn (death 2006-Mar-03)
♂ stillborn (death 2003-Nov-15)
♂ Patouk (death ≥ 2001)
♂ unknown (death 2001-May-17)
♂ George (transfer 1994-Apr-24)
♀ Priscilla II (unknown ≥ 1988)
♂ Farouk (death 1988)
♂ Woofy II (death 1988)
♀ unknown (unknown ≥ 1982)
This park received at least seven walruses for their opening in 1988. Two died from around March to May of that year, while five ranging in age from 1 to 20 remained at the park -- one was George, a year old rescued calf, while another was Priscilla, a 20-year-old cow.
The 1982 individual is an error from the North American regional studbook; I believe it to likely represent Priscilla II.