Calvin Crest is a private group-events conference center on the south edge of Nelder Grove. It contains some logged areas but has a few still-standing mature sequoias. Since a couple of the trees appeared to be of significant size, I planned a quick visit to the place to check them. With the camps office's gracious permission, I was able to explore and take measurements of the two biggest trees there.
The larger of the two named trees is the Calvin Spire. It has a significant-sized base, about 77 feet ground perimeter, just under 59 feet breast-height circumference, and is 230 feet tall. However, it does not retain the large basal diameter up much of its height, so it comes nowhere near to achieving the volume to get onto the Largest Trees list. Though it isn't a very tall tree, it is unique looking and appropriately named. It has a foliage-free bare spire above a toroidal corona of verdure at about 160 feet, making it look rather like a cotton ball with a needle running through it.
The John Knox Tree is slightly smaller and much more conventionally shaped. Its measurements come in at 56.5 feet ground perimeter, just over 40 feet breast-height circumference, and about 200 feet of more typically shaped column height. It's an attractive tree, but neither Knox nor the Calvin Spire is big enough to add to my largest trees list.
Nearby Nelder Grove makes a good place to camp when exploring either in the Calvin Crest area or the Nelder Grove itself if you have extra time.