This report presents an analysis of incidents reportable to the U.S. Department of Transportation on approximately 160,000 miles of liquid petroleum pipelines in the U.S. during the eleven-year period from 1986 to 1996. The analyses presented herein represent work conducted by the U.S. Department of Transportation's, Office of Pipeline Safety and the operators of liquid petroleum pipelines through the American Petroleum Institute to better understand the causes and consequences of incidents, to monitor trends that may indicate the need for action, to use the data to identify potential risks and where risk management would be most productive, and to identify areas for potential improvement in the data collecting process. This document includes information on general trends of the incidents, trends based on attributes, analysis of incidents by cause, and a data disk containing the incident data for the 11-year period