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The 400-ft high tower 2-C for the Sacramento River crossing of the Shasta-Tracy transmission line is located on a hill adjacent to the river. When the site was investigated in 1951, prior to construction, an old major slide caused by river dredging was evident; however it was decided that the tower could be safely located at the site if certain precautionary measures were taken. In 1955, a strong earthquake precipitated another major slide at this location, placing the scarp only 125 ft from one tower leg; therefore remedial measures were undertaken to increase the stability of the hill. This paper describes the investigations conducted to study the mechanics of the problem, the analysis of the slide condition, the remedial-construction measures performed, and subsequent field observations.
Holtz, W. G.
Chief, Bureau of Reclamation, Denver, Colo.