I looked in the new regs. Freshwater Salmon as well the Freshwater synopsis . There is no mention of any boundary signs on the Mamquam system . There is fishing for trout throughout the whole system . Their is no fishing in the tributaries to the Mamquam river . I was informed by a local Whistler guide and through my experience from past fishing in the Squamish area that Fisheries sometimes will post a notice for the boundary sometime around Sept 15 or sooner . Pink salmon may be different . This will probably indicate that it will be for salmon fishing from the rail bridge on the Mamquam downstream to the confluence to the Squamish River I don't know what the quota for pinks are on that system , but I know you are allowed 1 hatchery marked Coho per day . Your best bet for any information regarding where you are going to fish . CALL the local fisheries office in the area you are going to go fish . Also get a name , first and last name of the fishery officer you talked to on the phone and carry it with you in case you are hollered at again , you can give the holler people the name and number and they can holler at them . My 2 cents