REPORT 
OF 
LIEUTENANT G. K. WARREN, TOPOGRAPHICAL ENGINEER 
OF THE 
“SIOUX EXPEDITION,” 
OF EXPLORATIONS IN THE DACOTA COUNTRY, 1855. 
Wasutneton, D. C., March 15, 1856. 
‘* Sioux Expedition’ required me to go up the Missouri: river to Fort 
Pierre, lay out a military reserve for that post, and examine the river 
as high up as the mouth of the Shyenne. 
mouth of the Big Sioux, by the direct route through Minnesota. 
ver the routes thus traversed, sketches and notes were taken, and 
collateral information was sought from every available source. I have 
given the Indian names, as well as the French and English, to objects 
and localities, and in writing the Dacota words have adopted, as far as 
possible, the spelling used in the Dacota Grammar and Dictionary, 
published by the Smithsonian Institution. Dacota being the proper 
name for the so called Sioux. * 
The routes traversed lead over the great plains between the Missouri, 
the Platte and the Shyenne, and nowhere entered the mountains 
the geology of this interesting section, which is believed to be mainly 
of the tertiary and cretaceous formations, much new information has 
been gained by Dr. F. V. Hayden, who is at present preparing his ; 
results. To his preliminary report [in Appendix E] I would call 
especial attention on account of its general interest. on 
note concerning specimens of rock from a ravine on |’Kau qui 
Court has been prepared by Mr. W. P. Blake, and will be found in 
Appendix E. 
-* The letter a, is always sounded as in father; e, as in they; i, as in marine 
ch as in cherry. 
