Oregon Revised Statutes Revenue and Taxation § 307.827

(A) Used in logging or forest management operations involving timber harvest, including the felling, bucking, yarding, loading or utilization of timber, logs or wood fiber in the forest, or used in reforestation, forest vegetation restoration, site preparation, vegetation control, stand and tree improvement or thinning;

(B) That is specifically designed for activities related to water quality or fish and wildlife habitat protection in the forest; or

(C) Consisting of excavators used in logging road construction, maintenance, reconstruction or improvements, including the closing or obliterating of existing forest roads.

(A) Equipment used in nonforest applications for more than 20 percent of the tax year, as measured by the operating hours of the equipment.

(B) Equipment used in the manufacturing or milling of forest products.

(C) Power saws, hand tools, blocks or pulleys that are not a part of the equipment, rigging, shop equipment or support equipment.

(D) Logging equipment that is exempt from tax under ORS 307.831.