There is created the Deschutes River Scenic Waterway Recreation Area consisting of the segment of the Deschutes River scenic waterway under ORS § 390.826 that is designated as the segment from immediately below the existing Pelton reregulating dam downstream approximately 100 miles to its confluence with the Columbia River, excluding the City of Maupin as its boundaries are constituted on October 4, 1977. [1987 c.624 § 17]