From Boulder, Utah (on Utah 12) to the West end of Utah 12 (at the tiny town of Red Canyon City) at the US Hwy 89 junction, is considered the Northern limits of the the Grand Staircase of Escalante National Monument (NPS). The Southern limits is the Colorado River System and the Arizona State line. While the Eastern limits of Grand Staircase is the Escalante River, with the Western limits is US Hwy 89. This would include the entire Calf Creek Canyon with the Escalante River SE to the Colorado River system at the center of Lake Powell. Also included is the Straight Cliffs of the "50 Mile Mountain", The Kaiparowits Plateau, Kotochrome Basin, the Paria River, and the Paunsaugunt Plateau that is owned and managed by Bryce Canyon N Park and the Dixie N Forest.
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