These are the directions I found to the shooting area at Harris Park.
"The Harris Park area is much larger (100-200 yards). You take 285 to 43, take the fork in the road to I think 47…you will know when you see it. Keep going through housing until you reach the little town of Harris Park, Make a right before the white fire station, make a left at the fishing pond, proceed through the forest service sign and keep going. The road comes to a T, and you make a right. You will take the next left and it leads to the shooting area".