There is a small roost of BCNH's along the Don River that is visible from the Queen St. overpass of the DVP (Queen St. between River and Broadview).
Stand on the north side of the bridge directly over the river and look at a clump of shrubbery on the west bank. On Monday morning there were four birds perched about a metre above the water; at about 11:30 this morning (Wednesday), I spotted three.