ABSTRACT 



Precipitation events in the winter and spring of 1965 caused 

 significant erosion and numerous landslides in many parts of the 

 Idaho Batholith. Most slope failures were associated with roads. 

 An investigation of several representative failures in the Zena 

 Creek sale area on the Payette National Forest was conducted. 

 Details of the field and laboratory tests are given, and three ex- 

 amples of the stability analyses are presented. Causes of the 

 failures are discussed and recommendations for future construc- 

 tion in similar terrain are made. 



