Take 74 west, get off at the 1st Brookville exit, I think its either Rt 52 or 1 north. Anyways, follow that right up through downtown Brookville. go past the town, go straight through all the lights and keep going. You'll see all the different state park signs for ramps, camping, etc. Its almost exactly 45 minutes from the 275 Bridge at lawrencburg to the Bonwell ramp.