OAR 629-630-0150: Ground-Based Harvesting On Steep Or Erosion-Prone Slopes

(1) Slopes over 60 percent are subject to the requirements of Sections (3) through (8) of this rule. (2) Slopes over 40 percent where soils consist of decomposed granite-type materials, or other highly erodible materials as determined by the State Forester, are considered erosion-prone and subject to the requirements of Sections (3) through (8) of this rule. (3) Methods that avoid development of compacted or excavated trails are the preferred alternative for operating on steep or erosion-prone slopes. If the operation will result in excavated or compacted skid trails, operators shall apply sections (4) through (8) of this rule. (4) If skid trails are located on steep or erosion-prone slopes, operators shall locate them at least 100 feet from any stream channels. (5) Operators shall locate skid trails where water can drain off the skid trail and onto undisturbed soils. (6) Skid trails shall not be located straight up and down steep or erosion prone slopes for a distance exceeding 100 feet unless effective drainage and sediment filtration can be achieved. (7) Operators shall install effective cross ditches on all skid roads located on steep or erosion-prone slopes. (8) Operators shall limit the amount of ground with disturbed soils on steep or erosion-prone slopes as described in Sections (1) and (2) of this rule to no more than ten percent of the steep or erosion-prone slopes within the operation area .