Parking along the Ohio river

Well there are only 3 dams in the PA section of the Ohio, sounds like you been to the 2 in Allegheny county. The last one, Montgomery, is in Industry, Beaver County right before it flows to make the Ohio/WV border about 8 miles from the dam, the fishing is generally great below the dam for stripers, walleye, sauger, and bass(all 3:  lm, sm, spots) and by the 2 islands for bass and catfish(flathead, channel, and blues have been caught in this pool last few years), first island is 2 miles down, the other one Georgetown Island is right before it leaves PA. For the lock You have to park by the train tracks and it's a little bit of a hike down to the area where it's safe to fish. You take 68 toward Midland(Midland-Beaver Rd) and when you pass the old Lock 6 Restaurant you know you are getting close, look out for a street named Pleasant Hill or Grove as you come into the town and make a left then a right and you will see where to park and walk down to the tracks and then down to the lock & dam. There are a bunch of signs from PA game. Dont litter, the people in the houses  next to the tracks are nice as long as you arent littering. There is a boat launch  past Midland in the tiny town of Glasgow, I've only fished the 2 islands by boat and we launched from there. I use to go night catfishing down there a lot from boat with a friend. Chasing the flatty record.
 
In between Dashields and Montgomery, it's really easy to park in Rochester and not too bad in Monaca but Rochester is designed for bank fisherman, the fishing is hit or miss. Pleasure boats, ski-doos, jet-skis are ripping through there all evening during the week and all day on weekend so I dont fish there often.  Beaver River is right there and much easier fishing from the banks and all the same species in the Ohio are in that last section of the Beaver River up to the Townshend Dam in New Brighton, there is a "Fish Park" below the dam on NB side, fishing is great on Fallston Wall side but cant get there legally from that side, you have to walk or drive through a steel mills property .  Tons of docks, creek mouths, stream runs, bridges and structure to fish near from the mouth to the dam but a lot of people fishing also, no wake from boats really unless you are fishing the mouth or someone is an **** and wants to ruin their boat, pretty shallow, there are areas you can almost wade across. Stripers run in and leave. They were just in there for 2 weeks straight. The little shad never ran into the Beaver  so far this year that I know of, no one saw them that I spoke to while I was on vacation, when they come in, the stripers dont leave until they eat them all or they die. Closer to Montgomery back on the Ohio River I've seen guys fishing under the 376 Vanport bridge and at a point in Freedom(closer to Dashields) but no clue how they get there, both good spots I have fished from a boat. Maybe try to find a spot on Neville Island
 
Good Luck and if you plan to come this way and got questions, ask.

Yeah those boaters can drive a bank fisherman nuts, I was more trying to steer you toward the Beaver River side, it's no wake and the pleasure boaters pretty much only use it to get from their marina to the Ohio River and back to the marina from the Ohio. Beaver River is no-wake and at least in that section below the final dam you can catch all the same species. The Ohio is just so massive, if you aren't next to a dam or have a boat to cover water and explore some the fishing can be hit or miss. The Beaver is like a large creek when you compare it to the Ohio.
 
Even with the heat, the pike are acting like it's fall, moving into the shallows to attack any poor fish they can find. I've caught 3 average sized pike(22, 24, and 25) the last 2 evenings wading in 18-30 inch deep water on whopper plopper 110 and 130s about 1 mile from the mouth of the Beaver River. Also lost a large esox shaped fish that was really taking line before spitting my plopper. That was probably my 2017 musky I been trying to catch all year. Seen 2 more pike(27 and 29") caught by a young couple on live shiners under a bobber farther up river closer to NB dam. Where I caught the 3 pike, the pike and muskies put on a show every evening busting on baitfish, crappie by a laydown, and I suspect they are eating sauger. Because the water is shallow, sometimes you can see them chasing fish for some distance, I watched one little fish skip across the water like a rock for 15-20ft. Never seen nothing like it