Crow Butte State Park

• Tri City Herald article
• Site for the successor park
• Google news search

Lake Cushman State Park

• Google news w/ relevant hits
• The private resort that the park turned into

Summer Falls State Park

• Now operated by Bureau of Reclamation?
• Google news search

2009 transfers

• This RCO meeting agenda indicates post-2009 transfer of Osoyoos, Fort Okanogan, Fort Ward and Fay Bainbridge to other than state control
• This document mentions 2011 transfer of Fort Okanogan State Park and Huckleberry Island (a state park?).

Griffin Bay

So far I can't find any information on the disappearance of Griffin Bay State Park.