Never launched up there, but I do put-in above Lock 7 quite often and fish the stretch between 7 and 8 a lot.
I have passed a dirt ramp several times on the north side of the river while heading up into Rotterdam from Scotia, but I am not sure if that is the same ramp you are talking about. I'd love to hear how you make out, since I've had good luck with some decent wally's below the Lock 8 dam over the years.
As a kid in the late 80s I also used to target Tiger Muskies right by the GE Turbine Warm Water Outlet in Rotterdam near Route 5S. My parents would drop me off on their way to Rotterdam Square Mall back when it first opened (and the Tiger Muskie Project on the Mohawk was just starting out). Live Shiners (from the old Nicks Field & Stream) used to produce a TON of bass, a few pike, and four Tigers in my youth. I still remember each of them.
You will see the outsource easily. There is a two-story pumphouse right on the river, and you can see the GE Complex behind it, across 5S. Definatley worth a look, you will see the current eddy behond the subsurface outlet. Apparently the water is really warm coming out of there!
Can't wait to hear a report. I love the Mohawk. I know a few other guys on here hit it often too.
I say Lock 7 is best for just about all Mohawk species, but the WALLEYE have always seemed to stack up in Rotterdam at Lock 8. But there's good ones below all the dams, I would imagine. Good luck Hunter!
"I love fishing. You put that line in the water and you don't know what's on the other end. Your imagination is under there" -Robert Altman