Trident Tree, The McKinley Groves third largest Tree is 15.7 feet in diameter at chest height, 62.5 feet in perimeter, and 250 feet tall. Its very elliptical due to the triple leaders crowning its top. If you measure it visually from the north or south it looks like a 28k cubic feet tree, if you measure it from the east or west it looks like a 18k volume. Using an elliptical model it comes out at about almost 22k.