THE PANAMA CANAL 



203 



the: middle: wall, op the: gatun locks 



The size of the structure can be appreciated by noting the man at the bottom. The great 

 cylinder is the culvert to fill or empty the locks (see page 202) 



The section from Frijoles to Gamboa, 9 

 miles, is complete to grade and has been 

 turned over to the Central Division for 

 use in wasting material. This includes a 

 steel bridge across the Chagres nearly 

 one-quarter of a mile long. From Gatun 

 to Frijoles a temporary line was com- 

 pleted up to grade 60 in April, 1910, and 

 maintained ready for operation at any 

 time during the past wet season that the 

 old line was flooded out. 



About 3,000,000 cubic yards are still 

 required to complete the embankments 

 of this section to elevation 95, and every 

 effort is being made to finish the entire 



line to Gamboa, 31 miles, to full grade 

 by January 1, 1912. On this date it is 

 expected that work in the Gatun spill- 

 way will have progressed sufficiently to 

 begin raising the lake to elevation 55. 



Construction of the line from Gamboa 

 to Paraiso, east of the cut, was started 

 in January and will be pushed with a 

 view to completion by January 1, 1912, 

 if possible. As the greater part of the 

 road passes through the lake, reinforced 

 concrete culverts are provided to equal- 

 ize the water on both sides of the em- 

 bankments. 



