"When was Crater Lake established as a National Park?"

Answer: Crater Lake: the 5th, 6th, or 7th park established? It depends on how you look at it. If you only consider existing national parks, Crater Lake could be numbered as high as the fifth national park. Crater Lake became #5 with the decommissioning of Mackinac Island and the absorption of General Grant into the current Kings Canyon National Park. If you allow General Grant to remain, we are #6 on the list. If you stick to the original list, regardless of present status, Crater Lake was the seventh national park to be established.