I'm not sure the following is absolutely correct, so comments are welcome.
Until October 15 the river is fly only and is open above the hatchery. I think this means that you can fish the pool above the hatchery and below the E&N bridge also. The hatchery lets a certain number of salmon through (I thought I heard 2,000) and then strips the rest.
From Oct 15, the portion of the river downstream of the counting fence to the boundary of the reserve opens, and the entire river is open to gear.
From October 15 the fishing becomes a bit of a zoo and is shoulder to shoulder with gear fishing.
Last Saturday I did see a couple of people fishing with gear below the counting fence near the reserve boundary. Two COs came up as I watched and checked them out. Looked like they received presents from the COs, and lost some gear.