Frenchy, other fisheries are just as slow, if not more, this time of the year due to low abundance of food source and cold temperature.
From now until April, other fisheries in Southern BC include:
Squamish and Cheakamus River- Bull trout and steelhead. The steelhead fishing does not usually pick up until March and April. They are in even lower abundance than the Vedder River and it is a total catch and release fishery for all species. The fishing is slow, but like Derek said, very scenic, and photo worthy.
Sloughs and streams on the North side of the Fraser River between Mission and Harrison River - Cutthroat trout. Highly migratory, requires a lot of time to find them. Experienced anglers also do not consistently hook them as their movement is so unpredictable.
Local lakes - These are usually stocked with rainbow trout by the Fraser Valley Trout Hatchery starting around mid March. The trout range between 10 and 14 inches in length.
Carp fishing - Starts as early as late February.