iADD.] 



ELEVATIONS. 667 



The heights of the mountains, &c., given are mostly barometric, a 

 few only being determined trigonometrically from adjacent points, and 

 those are marked with a t. The heights of Gray's and Torrey^s Peaks 

 are determined by angles of elevation and depression from Mount Lin- 

 colu, fore and back sights having been taken. The height of Mount 

 Lincoln is determined by means of a line run with spirit-level, and one 

 of the base-barometers was stationed near its summit, so that the 

 Lincoln barometer has been used as a base for determining the heights 

 of peaks above timber-line. But the barometer was not located on 

 Lincoln until after Gray, Torrey, and also Mount Evans were visited, 

 so the trigonometric heights of these mountains are given as being 

 nearer the true height than a barometric determination referred to 

 Denver as a base, 9,000 feet below. 



Capt. E. L. Berthoud calculated the height of Long's Peak, from a 

 base line, 8,400 feet in length, measured near the Big Thompson, as 

 13,767, assuming the bench at Golden City as 5,300 ; this, when reduced 

 to sea-level, gives the height of Long's Peak as 14,196 feet. The height 

 calculated from our barometric observations is 14,271 feet. 



All the heights depend upon the altitude of Denver, which has been 

 taken as 5,196.58 feet for the depot of the Kansas Pacific Eailroad, and 

 as 5,244.58 feet for the Denver signal-service barometer. 



The heights at Golden City and along the line of the Colorado Central 

 Eailroad to Longmont are taken from the levels of the construction-line 

 of that road. The heights on Clear Creek up to Black Hawk are also 

 from the Colorado Central Railroad levels. 



The heights of Georgetown, Downieville, and Fall River are deter- 

 mined from the survey for the Denver, Georgetown, and Utah Railroad, 

 and are the best results at present obtainable. The connection with 

 the Colorado Central Railroad levels is made at the bridge in Idaho. 

 Capt. E. L. Berthoud's preliminary survey made in 1866 agrees very well 

 at corresponding points. His levels make the height of Fall River as 

 7,719 feet; Downieville, 8,018 feet; and Georgetown, lower bridge, 8,514 

 feet. This survey was carried over Berthoud's Pass, the summit being 

 11,313 feet. 



MOUNTArNS. 



Elevation. 



Arapahoe, front range 13, 520 



Audubon, front range tV.i, 173 



Bald Mountain, front range, near Ward District 11, 493 



Mount Morrison, foot-hills 7,903 



Bergen's Mountain, overlooking Bergen's Park 9,773 



Bross, Middle Park, overlooking the Hot Sjirings 9, 468 



Bvers, Middle Park, divide between Williams and Frazier Eivera 12, 778 



Chief, foot-hills 11,833 



Coffin Top, overlooking Antelope Park 8, 003 



Conical Butte, Middle Park, upper Valley of the Muddy 9, 848 



Corral Peak, at the park head of Corral Creek 11, 333 



Evans, front range il4, 330 



Gray's Peak, front range <14, 341 



Griffith Mountain, overlooking Georgetown 11, 273 



High Point, front range, south of the Boulder road 11,988 



Hog-Back, between Big and Little Thompson Creeks 7, 923 



James Peak, front range 13, 283 



Lillie's Mountain, near Este's Park - 11,433 



Long's Peak, front range 14, 271 



McClellin, front range <13, 423 



Mount at head of Turkey and Cub Creeks 10, 623 



Park View, between Middle and North Parks 12, 433 



Powell, Park Kange 13,398 



Prospect Hill, in Este's Park 8.893 



Ralston Butte 10,598 



