Fishing Zug Bugs on a sinking line used to be effective when the PMD hatch was sparse or absent. I haven't fished a Zug Bug in years. Always go to a leech when conditions warrant. Not surprised to hear that the hatch is late this year.
The scuttlebutt is that CalTrout (and other groups) are leaning on Fish and Wildlife to amend the regs and not keep Fall River open to fishing year around. I think most people realize that was a bad idea.
"Radiate, radiate, radiate far and wide as the lines of latitude and longitude on a globe."
- John Muir