I just came from the Squamish/Mamquam after fishing it for a few hours this afternoon. An incident near Porteau Cove kept me on the road more than two hours on the way back.
Now to your question: there is still some fresh fish coming in, but they are fewer and fewer by the day. Lots of dead rotting fish can be found on the shore and in the water, so the stench is considerable. There are still lots of dark fish, with large humps (the males) and heavy coloration (the females).
Surprisingly, there are still a lot of people fishing for them and keeping some less than palatable fish. Oh, well, each to their own.
Water clarity is pathetic. Visibility today was hardly half a foot, so I didn't do very well fishing my floating line and small flies. I managed only 4 fish. I also foul hooked a few, but I long distance released them. Some "hot rods" around me fishing sinking tips were landing them by the dozen.
I don't need to tell you how many were properly hooked.
What irritated me the most was a couple fishing with bouncing betties and 10 foot leaders. They were snagging lots of fish and keeping them. They already had 8 dead fish on shore and told me that they could keep 10 because the kids that were with them were "allowed" two fish each.
I recorded them with my smart phone landing the fish themselves (the adults) without even passing the rod to the kids. I told them I was going to report them to the COs, so they quickly stopped fishing and left. I explained through their teenage daughter that the fishing technique they were using was frowned upon among real fishermen and that the fish were not biting their presentation. To prove my point I took the yarn off the hook and cast once out there and sure enough, fish on, hooked in the corner of the mouth facing the opposite shore.
They didn't seem the least bit surprised - they were obviously well aware of the flossing factor.
Can you still catch lots of fish in the Squamish? Sure, but with the low visibility, it will be a less than stellar experience if you are an ethical fisherman.
Cheers,
Milo