Kemp Lake is located in Leasburg, MO which is about one hour west of St. Louis in Crawford County off Highway 44.
From St. Louis: Take I-44 westbound to the Leasburg exit, Exit 214. At the end of the off ramp, turn left, go over the bridge and turn left again on the service road (Old Hwy 66). Go for 1 1/4 miles to the first gravel road on the right. This is Grotemac Lake Road. Turn right on Grotemac Lake Road and go .6 miles to a stone and iron gate entry at the top of a hill. Turn left into the property.
Most GPS systems will get you there if you search for Kemp Lake, Leasburg, MO.