Posted: Sat Jan 20, 2018 8:20 am
by KoutaR
According to conifers.org, the tallest is 69.8 m (229 ft).
The tallest known, diameter 175 cm, height 69.8 m, is near Tiller in Umpqua National Forest, Oregon (Van Pelt 2000, 2001; Tanner Lakes Titan ht/dbh data from 2011 remeasurement, email, J. Black, 2011.07.27).

http://www.conifers.org/cu/Calocedrus_decurrens.php

Not reliable?