I have a thing for crossing frozen back-country lakes in winter. Snowshoe across Garibaldi lake on BC Coast to Sentinel Bay to this date ranks as one of top 10 trips I've done in my life on global scale. In the Rockies I have upper K-lake and Spray lake lined up, but for last trip of 2015 I thought I'd visit Boom lake. Earlier this August I did a quick jaunt up there and picked up faint trail that continues along north side (just past the slide one takes as Kane access for Mt. Bell). That trail was initially reasonably good, but eventually faded out in deadfall and awkward side-hilling around small bays (remnants of several primitive campsites here too). I never made it to far end as it was getting too difficult. In contrast, winter trip makes it so easy -- you just glide across frozen lake; about 2km (1 way) in straight line. Ski tracks went about 2/3 of the way to nice icefall coming down huge avalanche gully below Mt. Bell. I continued on my own across fresh powder to far end -- about 30-40 minutes only from end of hiking trail at east end. Very pristine and beautiful -- only regret, this time of year -- you gotta be here mid-day when sun is still in the east to avoid afternoon shade when sun moves behind Mt. Boom. Couple of pictures:
[East end of the lake from end of hiking trail; pic taken on return]
[Boom Mountain from little bay below Mt. Bell about 2/3 of the way across]
[Fabulous glow at sunset looking east towards Storm Mtn]
Bit about the trail. Variety of users -- skiers, snowshoers and boot tracks as well. Well packed, but as far as skiing goes this is couple of notches harder than trackset nordic skiing you do at Mt. Shark or Canmore Nordic center. It is wide enough but there are steep sections, some uneven bits and couple of deadfalls. Most challenging bit is directly above the parking as it is steeper and there is one sharp curve. Going in I witnessed several people wiping out in opposite direction; it is definitely not for beginners.
Looking around a bit more, this area is very interesting to explore in winter. At the other side of Boom Mtn is Chickadee valley, which Vern used as approach during winter ascent of Mt. Boom. Crossover between Boom lake and Chickadee valley is also possible - as shown in this report. This one seems suited only for very advanced back-country folks & conditions must be right as there is real avalanche danger.