SURVEY OF THE COLORADO OF THE WEST. 
9 
RIVERS. 
As before stated, the greater part of the country embraced in this 
survey was an unknown region in geographic science. An examination 
of the map prepared by the War Department from data collected up to 
1808, being a compilation of all knowledge of this class concerning the 
territory of the United States west of the Mississippi ltiver accessible 
to geographers, will show that this region is left an entire blank. We 
have filled this blank and completed the survey of the last unexplored 
region, mapping minutely the unknown portions of the Green and Col- 
orado Divers. 
The junction of the Green and Yampa Divers has been fixed, and the 
lower course of this latter stream, which was unknown, has been 
mapped. The junction of the San Kafael with the Green has also been 
fixed, and the lower course of this river mapped. I t was also unknown. 
The junction of the Grand and Green has also been determined, and 
the lower course of the Grand mapped. 
The Dirty Devil Diver, more than two hundred miles in length, was 
discovered and mapped. The Escalante, a river more than one hundred 
and fifty miles in length, was discovered and mapped. The junction of 
the San Juan with the Colorado has been determined, and the lower 
course of that stream, which was unknown, has been mapped. The 
Paria, a stream one hundred and twenty-five miles in length, which had 
been seen only atone point near its mouth, has been traced for its entire 
course. The junction of the Chiquito, or Little Colorado, with the Dio 
Colorado, or Colorado Grande, has been fixed, and the lower and previ 
ously unknown course of that stream has also been traced. 
The lower part of the Kanab was seen by Lieutenant Ives, but was 
mistaken lor the Colorado itself, and on his map the Colorado was 
turned to the northeast, conforming to the course of the Kanab. This 
stream is more than a hundred miles long. Its whole course has been 
traced. In some places it does not carry a great volume of water, and 
about midway of its length it is often lost in the sands, but through the 
greater part of its course it runs through a deep gorge, which makes a 
very important feature in the topography of the country. The Rio Vir- 
gen had been seen at points, but we have traced its entire course and 
that of all its tributaries. A great number of smaller streams have also 
been discovered and mapped. 
CANons. 
The whole region embraced in the survey is a canon country. At the 
very beginning we have a series through the Uintah Mountains, as the 
channel of Green Diver: Flaming Gorge, Kingfisher Canon, Ded Can- 
on, the Canon of Lodore, Whirlpool Canon, and Split Mountain Canon ; 
then Yampa Canon, the canon along the lower course of the river of 
the same name, and many other tributary canons 5 then below, still de- 
