Yes you can catch chum and chinook using spinning lures and I have caught both.
At this point you need to get on the river . Basically you can walk the lower Alouette from Neaves Road down to Harris Road.
The river is affected by tides from the Fraser and can change practically by the minute during large tide movements. Low water & low tide is a good time to observe the river structure. Salmon will often hold in deeper sections in low tide and or low water. It is also affected by the water levels in the Fraser so in late spring and early summer will be higher than at most other times.
Drop in to Hatchmatcher Tackle and ask for lure recommendations. Personally I like a#3 spinner such as a Mepps for coho in normal water conditions. Gibbs Crocs or Lure Jensen Crocodiles are good spoons. These lures work well in all the streams I mentioned. There are too many other options to list.
The coho run in most of the North valley rivers is later than the Vedder/Chilliwack. Fish don't show until late in October and it peaks in November. The runs are shorter in duration - maybe a few weeks at best.