A stoppage is when navigation would be halted whether or not there are vessels to serve. A stoppage must be either scheduled or unscheduled.

Event code associated with a stoppage indicates where the stoppage occurred prior to what event during lockage.

BOS

 Stoppage/slowdown occurred prior to Bow over Sill (BOS).

EOE

 Stoppage/slowdown occurred prior to End of Entry (EOE).

SOE

 Stoppage/slowdown occurred prior to Start of Exit (SOE).

EOL

 Stoppage/slowdown occurred prior to End of Lockage (EOL).