OAR 437-007-0675: Selecting, Preparing and Rigging Trees

(1) Tail and intermediate support trees must be carefully chosen by a competent person based on position and strength necessary to support the imposed loads. (2) Raised trees must be identified and marked as such. (3) Trees must not be topped during windy weather. (4) At no time must topping, rigging up, or stripping work be done when visibility is impaired. Figure 7-30 — Topping Trees [Figure not included. See ED. NOTE.] (5) Loose equipment, rigging, or material must either be removed from the tree or securely fastened. (6) Skylines with breaking strengths greater than 1-inch IPS (or equivalent) must not be hung in trees where the tree diameter at the point of attachment is less than 12 inches unless precautions are taken to prevent the tree from pinching off. (7) A skyline must not make an angle greater than 50 degrees measured from the horizontal as it leaves the tail tree unless additional precautions are taken to prevent the tree from failing. [ED. NOTE: Figures referenced are available from the agency.]