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The U.S. Army Corps of Engineers (USACE) owns or operates 236 locks at 191 sites, more than half of which have surpassed their 50-year design life. There are increasing concerns about their continued safe, reliable operation into the future, especially considering the fact that routine maintenance, lock dewaterings, and inspections sometimes occur at less than optimal intervals. Although critical repairs are prioritized, delayed maintenance increases the risk of failures that result in lock closures. One significant factor that contributes greatly to the difficulty of lock condition assessment is that much of the lock infrastructure typically remains under water. When a lock is dewatered, it is common to find previously unidentified distress, deterioration, and damage. To address such maintenance issues, there is an increasing need to gather more accurate information on repair needs and to prioritize those repairs. This work investigated types and frequencies of lock failures so that sensors can be used more effectively to identify imminent lock operational failures and concerns for ongoing lock reliability. Numerous data sources were used to collect these data, even though most of these sources were not created for the purpose of collecting the type of data the work investigated. The data gap is also discussed in the report. DISCLAIMER: The contents of this report are not to be used for advertising, publication, or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. All product names and trademarks cited are the property of their respective owners. The findings of this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents. DESTROY THIS REPORT WHEN NO LONGER NEEDED. DO NOT RETURN IT TO THE ORIGINATOR. ERDC/CERL TR-17-17 iii

Investigation of mechanical breakdowns leading to lock closures