Gary near Tebbetts from Tebbetts on 10/3/2008 7:55:11 PM:
Go to Google maps and type in Clasville MO. Basically, if you are coming from Columbia, you make a right turn onto the Claysville road (it's after you go past the golf course turn off but before you get to the rock quarry. There is not a trail head but you will most likely discover the Clasville store - great place for family style fried chicken and cobblers.
An alternative would be to go to the North Jefferson trail head and ride to Hartsburg from there, it's only about ten miles and you could still stop in at Claysville (about half way to Hartsburg)