TABLE 4-34 - St. Lawrence Seaway (U.S. Portion) Downtime by Cause: 2004-2009

TABLE 4-34 - St. Lawrence Seaway (U.S. Portion) Downtime by Cause: 2004-2009

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Hours of downtime, unless otherwise noted

  Weather related Vessel incident All other causes Total downtime hours Weather (percentage of total) System availability (percentage)
2004 43.8 15.0 7.2 66.0 66.4 99.0
2005 16.9 12.1 6.0 35.0 48.3 99.5
2006 19.1 34.5 8.8 62.4 30.6 99.1
2007 39.7 23.6 10.4 73.7 53.9 98.9
2008 39.4 7.1 13.5 60.0 65.7 99.1
2009 6.7 0.9 9.3 16.9 39.6 99.7

NOTES: Weather-related causes include poor visibility, high wind, and ice. All other causes includes lock equipment malfunction, civil interference, pilotage, and water level/flow. These data pertain only to the two U.S. locks (Snell and Eisenhower) on the St. Lawrence Seaway between the Port of Montreal and Lake Ontario. Canada operates another five locks along this portion of the Seaway. In addition, Canada operates locks at the Welland Canal along the Seaway. System availability does not include the time when the locks are closed for the winter, typically from late December to late March. Hours of downtime for 2009 have significantly decreased due to good weather and fewer vessel-related delays.

SOURCE: U.S. Department of Transportation, Saint Lawrence Seaway Development Corporation (SLSDC), personal communication, September 2010.