Table 4 - U.S. Seaway System Downtime/Availability in Hours ,,,,,,
Cause of delay,2002,2003,2004,2005,2006,5-year average
"Weather, poor visibility",36.8,39.3,32.5,15.2,16.3,28.0
"Weather, high wind/ice",4.3,18.3,11.3,1.7,2.8,7.7
Water levels/flows,0.0,0.0,0.0,0.0,0.0,0.0
Vessel incident,16.9,15.9,15.0,12.1,34.5,18.9
Civil interference,2.0,0.0,1.0,0.0,0.0,0.6
Pilotage,0.0,0.0,0.0,3.3,0.0,0.7
Lock equipment malfunction,3.1,0.0,6.2,2.7,2.5,2.9
Other,0.0,0.0,0.0,0.0,6.3,1.3
Total delay (hours),63.1,73.5,66.0,35.0,62.4,60.0
Equivalent days,2.6,3.1,2.8,1.5,2.6,2.5
Duration of season (days) ,276,273,281,280,283,279
Percent of U.S. System availability,99.1%,98.9%,99.0%,99.5%,99.1%,99.1%
SOURCE:  St. Lawrence Seaway Development Corp. Lock Operations Records,,,,,,