Mark Twain Lake, August 5, 2021 – UPDATE - The Mark Twain Lake level on Thursday, August 5, 2021 is 619.2 NGVD. Normal lake elevation is 606.0 NGVD. All four lane boat ramps are open with courtesy docks in at Robert Allen, South Fork, Stoutsville and Spalding. Ray Behrens boat ramp is open, however it does not have a courtesy dock in place. You will likely find floating and submerged debris on the lake so please be cautious and always wear a life jacket.