TOPOGRAPHICAL REPORT OF NORTHERN DIVISION, 1874. 



By Story B. Lai>d, M. E. 



Washington, D. C, June 1, 1875. 



Sir : I have the honor to submit to you the topographical report of 

 the northern division of the United States Geological and Geographical 

 Survey of the Territories, to which I was assigned as topographer, for 

 the season of 1874. 



The party, in charge of Mr. A. K. Marvine. geologist, left the ren- 

 dezvous camp, near Denver, on the 20th of July. A camp Avas made 

 for three days near Golden City, and a detailed survey made of the 

 country between Ealston Creek and Mount Morrison. We crossed the 

 Front or Colorado range by Berthoud's Pass, and traversed the Middle 

 Park to our field of work north of the Middle Park. 



The first station was made on the 1st of August, and the last one on 

 the 20th of November. The wagon-road from the White River Indian 

 agency to Eawlings Springs was taken, and Rawlings was reached on 

 the 28th of ISlovember, and Denver, by railroad, on the 30th. 



Mr. Wm. S. Holman, jr., took the supplies for the party, and a mercu- 

 rial barometer to the White River agency, via Rawlings, and the 

 wagon-road from that point. The barometric station which he estab- 

 lished there is the base on which the majority of our altitudes depend. 



The plan of the topographical work is exactly the same as used the 

 year before, and as adopted by the other parties. 

 Very respectfully, yours, 



STORY B. LADD. 



Dr. F. V. Hayden, 



United States Geologist, in charge of the United States 



Geological and Geographical Survey of the Territories. 



REPORT. 



The country assigned to the northern division, to be surveyed during 

 the season of 1874, is north and east of the Middle Park, in Colorado. 

 The northern limit was north latitude 40° 30' and the southern the 

 Eagle River from its source at the summit of the Mount Powell range 

 to its junction with the Grand River, and then the Grand. On the east 

 the work was to connect with that of the previous year on the western 

 and northern sides of the Middle Park, and to the west the work was 

 to be continued as far as the season would allow. 



The most western point reached was nearly to longitude 108<^, though 

 the average limit is about 107° 45'. This arrangement gave us a narrow 

 strip north of Middle Park, covering the southern end of the North 

 Park, of an average width of about eleven miles, and extending from 



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