28 
POOLE’S SURVEY FROM SAN DIEGO TO FORT YUMA. 
present rates, would "be the heaviest burden of expense the enterprise would have to sustain. 
For the interior division about 400 per cent, is added to this item in the estimate. 
Accompanying this report is a table of grades, distances, and elevations of the route surveyed 
together with a profile exhibiting the gradients adopted as the location of the line of the road. 
It is believed that future investigations will not tend to increase them, but will probably result 
in bringing to light lower and still more favorable locations and grades than have yet been 
discovered. 
With high esteem, I have the honor to he, respectfully, your obedient servant, 
CHARLES H. POOLE, 
Chief Engineer San Diego and Gila 
Southern Pacific and Atlantic Railroad Company. 
Lieut. John G. Parke. 
Topographical Engineers , United States Army. 
Table of grades , distances, and elevations of the proposed route for a railroad from San Diego to 
the Gila river. 
This appears to be an error—317.27? a. h. c. 
