Oregon Revised Statutes Small Watercraft § 830.115

The State Marine Board shall at least once every three years conduct a survey of owners and others to determine, by county, the kinds of boating activity on the various waters of the state during different periods of the year. Boating activity in a county shall be determined by taking into consideration the number and kinds of boats engaging in different boating activities in the county and the number of days during the last fiscal year that such activities were carried on in the county. The board may also consider other factors relating to the enforcement of boating safety and traffic regulations provided by this chapter and the regulations adopted pursuant thereto.