603-095-0140 Required Prevention and Control Measures All landowners or operators conducting activities on lands described in OAR 603-095-0120(2) and (3) must comply with the following rules: A landowner or operator is responsible for only those conditions caused by activities conducted on land managed by the landowner or operator. These rules do not apply to conditions resulting from unusual weather events or other exceptional circumstances that could not have been reasonably anticipated. (1) Erosion: (a) There must be no visible evidence of erosion resulting from agricultural activities in a location where the eroded sediment could enter waters of the state. (b) Visible evidence of erosion consists of one or more of the following features: (A) Sheet wash, noted by visible pedestalling, surface undulations, and/or flute marks on bare or sparsely-vegetated ground; or (B) Active gullies, as described in OAR 603-095-0010(1); or (C) Multiple rills, which have the form of gullies but are smaller in cross section than one square foot; or (D) Soil deposition that could enter surface water; or (E) Streambanks breaking down, eroding, tension-cracking, shearing, or slumping beyond the level that would be anticipated from natural disturbances given natural hydrologic characteristics; or (F) Underground drainage tile outlets that contribute to soil or bank erosion. (c) Private roads used for agricultural activities, including road surfaces, fill, ditch lines, and associated structures, must not contribute sediment to waters of the state. All private roads used for agricultural activities not subject to the Oregon Forest Practices Act are subject to this regulation. (2) Streamside Vegetation: (a) Landowners or operators must allow vegetation, consistent with site capability, to become established along perennial and intermittent streams to protect water quality by providing shade, filtering out pollutants from surface runoff, and protecting streambank integrity during high stream flows, such as would be expected to follow a 25-year, 24-hour storm. (b) If any agricultural activity disturbs enough streamside vegetation to impair the conditions and functions described in 603-095-0140(2)(a), the landowner or operator must replant or restore the disturbed area with vegetation that will provide the functions required in 603-095-0140(2)(a). (c) Agricultural activities are allowed if they do not impair the conditions and functions described in 603-095-0140(2)(a). (3) Irrigation Water: Irrigation discharge, both surface and subsurface, that enters waters of the state must not exceed water quality standards or cause pollution of the receiving water. (4) Nutrient Management: Landowners and operators must store and use feed, fertilizer, manure, and other sources of crop nutrients in a manner that prevents transport of pollutants to waters of the state. (5) Waste: Persons subject to these rules must not violate any provision of ORS 468B.025 or 468B.050. Statutory/Other Authority: ORS 561.190 - 561.191 & 568.912 Statutes/Other Implemented: ORS 568.900 - 568.933 History: DOA 16-2026, minor correction filed 02/25/2026, effective 02/25/2026 DOA 4-2015, f. & cert. ef. 1-29-15 DOA 3-2004, f. & cert. ef. 1-23-04 AD 3-1996, f. & cert. ef. 4-9-96