Pete Johns even made the trip to Tonka for a nice day of sailing and scrub races. About 10 of us sailed on solid 4-5 inches of black ice between Big Island and Greenwood shore. Harry and Dr. report that the main lake locked in on Friday night. It is smooth as glass! With 3 nights and days in the 5-20 F range, we plan to sail it on Monday around 10 AM.