Aloette River is also a good spot. You can also catch Steelies there but it's just catch and release (as far as I know).
Retention of hatchery steelhead is allowed on the Alouette River, but most seasoned anglers would recommend not to as its stock is small. If hatchery steelhead is required to be released in a particular system, it would be mentioned in the system's regulations, eg. Capilano River.
This PDF file of the Region 2 freshwater regulations is handy if anyone needs to check the regulations. It is also a good guide that can be used to explore new systems for both trout and steelhead.
Stream trout fishing in the Lower Mainland is spotty but available throughout the year. Most tributaries of the Fraser and Pitt Rivers have populations of cutthroat and rainbow trout. They are migratory, especially in systems that are tidal influenced. Due to this factor, there aren't "good" flows for this fishery. If there is, you are unlikely to hear to from those who target them regularly. Your best bet is to head out and try out a few streams, look for signs of fish, and make a few casts. Not seeing any trout at a particular system repeatedly does not indicate that the system will not produce.
http://www.fishingwithrod.com/articles/2005/1205_02.htmlyou gotta love 4lb largemouth crap! New species? Any pictures?
Didn't we pull out a 4lb crap a couple of years ago while you watched in Ladner?