Mark Twain Lake - Blackjack Marina will utilize two of the four lanes of the Ray Behrens Boat Ramp, beginning on May 1, 2017, to launch sections of additional slips for the marina. The sections of slips will be transported from the boat ramp to the marina, where they will be assembled. Work will occur Monday through Friday for approximately two weeks. During this time, the boat ramp will remain open for public use. The U. S. Army Corps of Engineers and Blackjack Marina requests everyone to use caution when in the area, launching and loading your boat, and while boating on the lake between the Ray Behrens Boat Ramp and Blackjack Marina.