OAR 629-630-0915: Statewide Harvesting; Standard Practice; Stream Adjacent Failures

(1) Operators shall extend the riparian management areas, described in OAR 629-643-0100 and OAR 629-643-0120, on all identified stream adjacent failures, as defined in OAR 629-600-0100. The riparian management area shall encompass the perimeter of the stream adjacent failure, defined in OAR 629-600-0100, however, the width of the riparian management area shall only extend to the lesser of: (a) The distance of 170 feet from the edge of a Type F or Type SSBT channel; or (b) The distance to the slope break, defined as 20 percent or greater reduction in slope gradient. (2) The landowner representative shall submit a written plan, described in OAR 629-605-0170(13), for timber harvest units where yarding is planned to occur within stream adjacent failures. (3) The landowner shall submit a written plan that describes how the number, size, and location of yarding corridors were selected to minimize impacts to the integrity of stream adjacent failures. (4) Cable yarding, which may require cutting, but not removal, of trees, is permitted through stream adjacent failures, but the number, size, and location of yarding corridors shall minimize impact to the integrity of the feature. The operator shall not remove trees cut for yarding corridors unless these are deemed safety hazards. (5) The operator shall make all riparian management area width measurements using the slope distance and shall measure them from the edge of the active channel or channel migration zone. (6) The department shall publish Forest Practices Technical Guidance to assist operators in identifying channel migration zones.