194 PRIMARY TRIANGULATION AND PRIMARY TRAVERSE, [bull.316. 
ridge breaks off to the north, giving a good view of the lowlands of 
the Colorado River in the big bend east of Picacho. The best way to 
go there is from Potholes, 12 miles from Yuma by road. 
Station mark: A bronze triangulation tablet cemented in rock in 
place under a cairn 9 feet high. 
[Latitude 32° 53' 46. 
Longitude 114° 33' 47.98".] 
To station— 
Azimuth. 
Back azimuth. 
Log. distance. 
Yuma azimuth 
14 05 58. 85 
43 21 27.24 
76 19 48.46 
174 47 27.17 
327 56 29.74 
194 04 11.71 
223 15 29.56 
256 13 38.72 
354 46 43. 66 
147 59 01.62 
Meters. 
4. 3251262 
Pilot . 
4. 3984893 
American . 
4. 2607025 
Clip 
4. 3582402 
Sugar Loaf 
1. 1376339 
Four new stations for the control of the Coalinga Special Map in 
Fresno County were occupied by Mr. A. H. Sylvester in October, 1902. 
This work was based upon the positions of Hepsedam and Castle 
Mount on the standard datum of the United States Coast and Geodetic 
Survey. 
HEPSEDAM, SAN BENITO COUNTY. 
A station of the United States Coast and Geodetic Survey on a 
prominent peak of the Mount Diablo range, in the southern part of 
the county. It can be reached from Coalinga by road via King City, 
Marthan Canon, Priest Valle} 7 , and down Lewis Creek to Captain 
Holletts. 
Station mark : A hole drilled in outcropping rock and filled with lead. 
[Latitude 36° 18' 53.60". Longitude 120° 49' 26.36".] 
To station— 
Azimuth. 
Back azimuth. 
Log. distance. 
Qak Flat 
299 44 51.81 
304 30 56.00 
313 34 08.71 
119 55 16.47 
124 38 04.00 
133 51 16.62 
Meter;:. 
4. 4829865 
Center Peak 
4.3414790 
Castle Mount • 
4.7804191 
CASTLE MOUNT, MONTEREY-FRESNO COUNTIES. 
A station of the United States Coast and Geodetic Survey on a high 
hogback, locally known as Black Mountain. It can be reached from 
Coalinga by rough road and trail via Parkiield, Turkey Flat, and 
Taylor's ranch, where accommodations can be had. 
Station mark : A copper bolt in center of top of theodolite pier. 
