I live about 5 minutes from the Washington KOA. This park is on a steep hill so be careful navigating it.
We go to Myrtle Beach every year. and the routh we follow is 73/74 to 52 to 77 to US19 to 79.
You will have one long pull on 77 as soon as you cross the NC / Virginia line. There is tunnel construction on 77 at the Virginia / WV line that causes delays and the lanes are narrow. They force all commercial traffic off 77 as they are to wide for these lanes. If you have a big rig I would take this truck route.
When you get to the Washington PA area 79 merges with 70. There is construction currently from the merge point to your exit. You will be taking the Beau Street exit. When you reach the stop sign at the end of the ramp turn right and follow the signs. Your GPS may tell you to exit 79 at the Labrotory exit but that route has tight turns. It is also very easy to miss the turn off the main road and you would end up in the city of Washington.
When you leave the KOA go back the way you came and get back on 79 north / 70 west at Beau Street. Stay in right two lanes once you get on interstate as both can take the exit for 79 north. It is only a few miles once you get on the interstate to the split.
Then it is about two and half hours or so to Erie PA which is far as I have gone.
Have a safe and fun trip!
Dave
