Skier-Down Flag Requirement
An operator of a motorboat (other than a PWC) on the waters of the Mississippi River, the Missouri River, or Missouri lakes between the hours of 11:00 a.m. and sunset must clearly display a skier-down flag whenever the towed person(s) is in the water.
A rectangular orange or red flag, at least 12 inches x 12 inches, must be displayed when the person is in the water before or after being towed. The flag should not be displayed while the motorboat is engaged in towing but should be displayed again when the towed person enters the water. PWC and moored or anchored motorboats are exempt from this requirement.