You Don't need to get on 40 from spring city. Just come up 27 to rockwood at the north end of rockwood highway 70 forks to the right take 70 about 5 miles go to the next left past the wal-greens go under the interstate and turn right there is a good launch right around the corner from the discharge and plenty of parking. You have to walk to the discharge. it is blocked to boats about 300 yards away. Hope this helps.