Map by the U. S. War Department, 1868. Supplied by the
courtesy of General Mackenzie, U. S. A., showing the knowledge
of the Colorado River basin just before Major Powell began
operations. The topography above the junction of the Green and
Grand is largely pictorial and approximate. The white space
from the San Rafael to the mouth of the Virgin is the unknown
country referred to in this volume which was investigated in
1871-72-73. Preliminary maps [B], [C], and [D] at pages 244-46, and
207 respectively, partly give the results of the work which
filled in this area.
Preliminary map of a portion of the southern part of the
unknown country indicated by blank space on Map [A], at page 95,
showing the Hurricane Ledge, Uinkaret and Shewits Mountains
and the course of the Grand Canyon from the mouth of Kanab
Canyon to the Grand Wash. The Howlands and Dunn left the first
expedition at Catastrophe Rapid at the sharp bend a few miles
below the intersection of the river and longitude 113° 30',
climbed out to the north and were killed near Mt. Dellenbaugh.
Preliminary map of a portion of the central part of the
unknown country indicated by the blank space on Map [A], at page
95, showing the Kaibab Plateau, mouth of the Paria, Echo
Peaks, House Rock Valley and the course of part of Glen Canyon
and of Marble Canyon and the Grand Canyon to the mouth of the
Kanab Canyon. El Vado is at the western intersection of the
37th parallel and the Colorado River, and Kanab is in the
upper left-hand corner of the map—just above the 37th
parallel which is the boundary between Utah and Arizona. The
words "Old Spanish Trail from Santa Fé to Los Angeles" near El
Vado were added in Washington and are incorrect. The old
Spanish trail crossed at Gunnison Crossing far north of this
point which was barely known before 1858.
Preliminary map of a portion of the northern part of the
unknown country indicated by the blank space on Map [A], at page
95, showing the course of part of Glen Canyon, the mouth of
the Fremont (Dirty Devil) River, the Henry (Unknown)
Mountains, and the trail of the first known party of white men
to cross this area. The Escalante River which was mistaken for
the Dirty Devil enters the Colorado just above the first
letter "o" of Colorado at the bottom of the map. The Dirty
Devil enters from the north at the upper right-hand side.
Showing results of recent re-survey of part of the Grand
Canyon near Bright Angel Creek by the Geological Survey with
ample time for detail. Compare with Map [C] at page 246—the
south end of Kaibab Plateau.
