Hours of downtime, unless otherwise noted
|Weather related||Vessel incident||All other causes||Total downtime hours||Weather (percentage of total)||System availability (percentage)|
NOTES: Weather-related causes includes poor visibility and high wind/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, as well as other Seaway locks at the Welland Canal.
SOURCES: 1995-2001-U.S. Department of Transportation, Saint Lawrence Seaway Development Corp. (SLSDC), Annual Reports (Washington, DC: Various years). Reports for 1997-2001 available at http://www.greatlakes-seaway.com/ as of March 2004. 2002, 2003, 2004, 2005, and 2006-SLDC, personal communication, March and December 2004, February 2005, May 2006, and June 2007.