Okla. Stat. tit. 63, § 4219

It shall be unlawful for any person to operate any vessel upon the waters of this state which are under the jurisdiction of the Grand River Dam Authority (GRDA), between the hours of one-half hour after sunset and one-half hour before sunrise at any speed in excess of thirty-five (35) miles per hour. Any person violating the provisions of this section shall be guilty of a misdemeanor and shall be punishable by a fine of not less than Fifty Dollars ($50.00) nor more than Two Hundred Fifty Dollars ($250.00).