I fish Henry's Lake every year and it is a great place to fish but I'd have to say for the most part brookies are uncommon. Maybe if you fish the hatchery hole in September you'll catch one. You can expect to catch a cutt (by far the most common) and maybe a hybrid up to 22-24 inches and you may catch a bunch of fish in the 18-20" range. I agree with JR, there are a whole bunch of places to fish within an hour, maybe even better than Henry's.