Montana's brookies

Brook trout aren't typically thought of as being terribly ferocious. Voracious, to be sure, but not aggressive per se. They'll collect as many mayflies and midges as their stomachs will hold, but streamers aren't generally used when targeting them. But over the past year, I've learned that they can be quite predatory and will hammer streamers as much or more than brown trout in many situations.
In Montana, most of the best brookie water is kept under wraps. I can tell you a dozen places where rookies could have a good day with small ones, but big brookies are hard to find.
The best place that I know of (that's not a secret) for big brook trout is Georgetown Lake. I've never fished it myself, but I've heard reports recently that they're back with a vengeance (it has suffered in the past 10 to years, apparently due to whirling disease).
Check out this video from Blackfoot River Outfitters (the brook trout action is from about 1:10 to 1:50):


The biggest brookie that Montana Fish Wildlife and Parks has surveyed there was about 20.5 inches in 2006. In 2007, about 60,000 4-inchers were stocked and in 2008,another 50,000 er so were added. By 2011, the population should be thinned out a touch, but their lengths should be getting up there. It might be a great year to investigate the brook trout bounty at Georgetown Lake.