Pacific service magazine . ed to later extend the line first to apoint just south of the San Joaquin Riverand finally to Newark or a new station lo-cated near Newark, the new route to stayclear of the Bay region where ocean fogsoccur. The first extension 29 miles south-erly to the new Contra Costa Substation lo-cated near Antioch will soon be type of construction, with the excep-tion of river crossings, is the same as the valley portion of the Pit River line, namely,double-circuit towers on concrete founda-tions, the conductor being 500,000 circularmil, 49-strand rope lay copper
Pacific service magazine . ed to later extend the line first to apoint just south of the San Joaquin Riverand finally to Newark or a new station lo-cated near Newark, the new route to stayclear of the Bay region where ocean fogsoccur. The first extension 29 miles south-erly to the new Contra Costa Substation lo-cated near Antioch will soon be type of construction, with the excep-tion of river crossings, is the same as the valley portion of the Pit River line, namely,double-circuit towers on concrete founda-tions, the conductor being 500,000 circularmil, 49-strand rope lay copper cable, .91inch in diameter and weighing lineal foot. The route selected for the line crossesthe Sacramento and San Joaquin Riversand the fertile Delta lands lying betweenthem. This section of the line requiredparticular attention as it involved the twolong-span river crossings together withdeep deposits of semi-liquid silt and peatfor foundations. The Sacramento Riverspan is 4135 ft. in length and the crossing. The 4S9-foot tower on the south bank of theSacramento river (Sherman Island). 280 Pacific Service Magazine is effected by using twotowers, one 459 ft. and theother 410 ft. in height,each backed up by ananchor tower 100 ft. highlocated approximately2000 ft. away. The SanJoaquin River is crossedby using three high towersbetween the two anchorstructures, the middletower being located on anisland in the river. As thespans are shorter (3175ft. and 2250 ft. respective-ly) these towers are 269ft., 359 ft., and 314 ft.,in height. The 459-foottower on the south bank of the SacramentoRiver is believed to be the highest struc-ture used for supporting a transmission starting final designs on the longspans crossing the San Joaquin and Sacra-mento Rivers preliminary studies weremade of various schemes in order to deter-mine the most economical type of construc-tion. It was first necessary to decidewhether the river crossing spans would betaken care of by suspe
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