Beside what has already been brought up by Steely (in a different thread) and James, here are some information that you should know about small streams in Southern BC.
They are not popularly fished because of a lack of consistent success. During the salmon season, most people focus on systems such as the Chilliwack, Stave, Chehalis, Harrison, Squamish, Capilano because they have a large return and is supplemented by strong hatchery production. Small systems are not where you would go fishing and intend to keep fish, because there simply aren't any fish worth keeping most of the time. Small systems in urbanized area are fragile due to habitat loss. Most of them are DFO projects where community-operated hatcheries exist. The fish put in them are products of many volunteers' time and effort.
Secondly, you would not find much information on the discussion forums about small systems, for two reasons. One is the above, that people do not fish them often. Two is that those who fish them often regard them as gems and would not broadcast the information publicly to protect both the system and their self interest. So the best action would be to venture out and try fishing them yourself, after you have checked the regulations to see which areas you can fish and what species you are allowed to target of course.
That being said, small systems have their own charm when fishing them. You will generally be able to fish in peace, without worrying about crowding. Small cutthoat trout and coarse fish are species commonly found in small streams.