OAR 340-204-0050: Designation of Prevention of Significant Deterioration Areas

(1) All of the following areas which were in existence on August 7, 1977, and for which the 1990 Clean Air Act Amendments clarified, shall be Class I Areas and may not be redesignated: (a) Mt. Hood Wilderness, as established by Public Law 88-577; (b) Eagle Cap Wilderness, as established by Public Law 88-577; (c) Hells Canyon Wilderness, as established by Public Law 94-199; (d) Mt. Jefferson Wilderness, as established by Public Law 90-548; (e) Mt. Washington Wilderness, as established by Public Law 88-577; (f) Three Sisters Wilderness, as established by Public Law 88-577; (g) Strawberry Mountain Wilderness, as established by Public Law 88-577; (h) Diamond Peak Wilderness, as established by Public Law 88-577; (i) Crater Lake National Park, as established by Public Law 32-202 ; (j) Kalmiopsis Wilderness, as established by Public Law 88-577; (k) Mountain Lake Wilderness, as established by Public Law 88-577; (l) Gearhart Mountain Wilderness, as established by Public Law 88-577. (2) All other areas, in Oregon are initially designated Class II, but may be redesignated as provided in OAR 340-204-0060. (3) The following areas may be redesignated only as Class I or II: (a) An area which as of August 7, 1977, exceeded 10,000 acres in size and was a national monument, a national primitive area, a national preserve, a national recreational area, a national wild and scenic river, a national wildlife refuge, a national lakeshore or seashore; and (b) A national park or national wilderness area established after August 7, 1977, which exceeds 10,000 acres in size. (4) The extent of the areas referred to in section (1) and (3) shall conform to any changes in the boundaries of such areas which occurred between August 7, 1977, and April 16, 2015. NOTE: This rule is included in the State of Oregon Clean Air Act Implementation Plan that EQC adopted under OAR 340-200-0040.