OAR 690-502-0150: Columbia Subbasin

The Columbia Subbasin includes the Willamette River main stem below Willamette Falls near river mile 27 and its tributaries, and all other stream systems in the Willamette Basin except for the Tualatin River and Clackamas River Subbasins. It includes the Multnomah Channel and Columbia Slough but does not include the main stem Columbia River. Surface water classification: (1) The following streams and tributaries are withdrawn from further appropriation except storage: (a) Johnson Creek and tributaries, except Crystal Springs Creek and tributaries for flows in excess of 10 cubic feet per second measured at the mouth, are withdrawn, by act of the Legislature, from further appropriation except for protection of fish life therein and power development not to exceed 25 theoretical horsepower. Appropriation and storage are allowed on Johnson Creek tributaries, but not the main stem, from December 1 through June 1 of each year, ORS 538.170; (b) Scappoose Creek is withdrawn, by act of the Legislature, from further appropriation, except for protecting fish life therein, domestic, livestock, municipal, fish culture, esthetic, recreation and public park purposes, ORS 538.251(5) and 538.260; (c) McNulty Creek, tributary to Scappoose Bay, is withdrawn, by act of the Legislature, from further appropriation except for storage during the period November 1 through March 31 each year, ORS 538.280; (d) Milton Creek is withdrawn by act of the Legislature from further appropriation except for domestic use year-round and storage during the period November 1 through April 30 each year, ORS 538.300; (e) Little Creek and tributaries, being tributaries to Scappoose Creek, are withdrawn from further appropriation except for storage, by order of the State Engineer dated August 13, 1951; (f) An unnamed stream, a tributary to the Columbia River flowing through Section 25, Township 1 North, Range 2 East, Willamette Meridian and Sections 19 and 20, Township 1 North, Range 3 East, Willamette Meridian is withdrawn from further appropriation by order of the State Engineer dated September 22, 1950. (2) The Willamette River main stem below Willamette Falls is classified for domestic, livestock, municipal, industrial, commercial, agricultural, mining, power, fish life, wildlife, recreation, pollution abatement, wetland enhancement and public instream uses. (3) Multnomah Channel and drainage waters originating within drainage districts are classified for domestic, livestock, municipal, industrial, irrigation, commercial, agricultural, mining, power, fish life, wildlife, recreation, pollution abatement, wetland enhancement and public instream uses. (4) Except as specified in subsections (1)(a), (b), and (c) of this rule, all stream systems in the Columbia Subbasin and Columbia Slough are classified year-round only for domestic, commercial use for customarily domestic purposes not to exceed 0.01 cfs, livestock and public instream uses.