Table 4
U.S. Seaway System Downtime/Availability in Hours

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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

  • Since opening in 1959, the St. Lawrence Seaway has enjoyed a high reliability rate in serving its commercial customers. The SLSDC maintains an annual reliability performance target of 99% for the U.S. sector of the Seaway, including the two U.S. locks in Massena, NY. During the 2006 navigation season, the SLSDC met its target with a reliability rate of 99.1%.
  • Of those delay elements that affect system availability, the SLSDC is most responsible for lock equipment malfunction. In 2006, lock equipment-related delays totaled 2.5 hours, representing four one-hundredths of 1% of the entire navigation season.



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