I just realized that there are actually 6 American zoos with underwater viewing for grizzlies, and 5 out of 6 have been built in the last 3 years. For a long time Woodland Park in Seattle was alone in that category, and I think that it might have been the first zoo in the world to have underwater viewing for grizzlies. It is still arguably the best habitat out of the 6!
The zoos and the year that the exhibits were built:
Woodland Park (1994)
Minnesota (2008)
Columbus (2010) - Kodiak subspecies
Memphis (2010)
Brookfield (2010)
Louisville (2011) - grizzlies to be rotated with polar bears
Not to be picky, but the Kodiak Bears and the Polar Bears are the only bears at the Columbus Zoo that have underwater viewing. The elderly female Grizzly Bear, the elderly male American Black Bear, and the Bornean Sun Bears do not have underwater viewing.
Anyways, the exhibit looks very nice for being so old. It reminds me a little of the exhibits for the elderly Grizzly and Black Bears at the Columbus Zoo. This exhibit just seems to be greener, and possibly larger, than the ones in Columbus.