2015 ORS 549.310¹
Application of ORS 549.320 to 549.400

ORS 549.320 (Petition by landowners to drain lands or improve drains) to 549.400 (Obstruction, befoulment or pollution of ditch prohibited) shall not be construed to interfere with or to prevent the right or power to construct drainage ditches under any other statute of this state, and shall apply only to that portion of the state lying west of the Cascade Mountains.

1 Legislative Counsel Committee, CHAPTER 549—Drainage and Flood Control Generally, https://­www.­oregonlegislature.­gov/­bills_laws/­ors/­ors549.­html (2015) (last ac­cessed Jul. 16, 2016).
2 OregonLaws.org contains the con­tents of Volume 21 of the ORS, inserted along­side the per­tin­ent statutes. See the preface to the ORS An­no­ta­tions for more information.
3 OregonLaws.org assembles these lists by analyzing references between Sections. Each listed item refers back to the current Section in its own text. The result reveals relationships in the code that may not have otherwise been apparent.