Table 4 U.S. Seaway System Downtime/Availability in Hours
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|
|Lock equipment malfunction||3.1||0.0||6.2||2.7||2.5||2.9|
|Total delay (hours)||63.1||73.5||66.0||35.0||62.4||60.0|
|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.