Pitt Lake is located to the northeast of New Westminster, and is an expansion of the Pitt River; see the Pitt River entry for more on this feature's name origins.
In this correspondence, Douglas reports that he toured Pitt Lake with a handful of local military, civil, and religious
dignitaries, in order to celebrate the auspicious natal day of our most Gracious Queen, amidst the wild romantic scenery of that mountain Lake.