Milton Creek and tributaries; withdrawal from appropriation; exception; existing rights. The unappropriated waters of Milton Creek and its tributaries, in Columbia County, are withdrawn from appropriation except for domestic use through the year and storage during the period beginning November 1 and ending April 30 of each year. Nothing contained in this section shall impair the existing rights of any person to the use of such waters

ORS 538.300 — under Chapter 538.